Category: Computer Programming Tutorials

Want to set up a **free AWS EC2 virtual machine**? 🚀 This tutorial walks you through **creating an AWS EC2 instance using the AWS Free Tier**—perfect for beginners exploring **cloud computing** and **server hosting**! By the end of this video, you’ll learn: ✅ How to **sign up for AWS Free Tier** ✅ How to **launch an EC2 instance** (Virtual Machine) ✅ How to **configure security groups & SSH access** ✅ How to **connect to your EC2 instance** ✅ How to **stop, start, and terminate** your instance — ## **🔹 What You’ll Learn in This Video:** ✔️ How to **create an AWS account** ✔️ How to **launch an AWS EC2 instance** ✔️ How to choose the right **Amazon Machine Image (AMI)** ✔️ How to connect to your VM using **SSH (Linux/Mac) or PuTTY (Windows)** ✔️ How to manage your instance efficiently — ## **🔹 Prerequisites** ✔️ A **Free AWS Account** ([Sign Up](https://aws.amazon.com/free/)) ✔️ Basic knowledge of **cloud computing** ✔️ A system with **SSH (Mac/Linux) or PuTTY (Windows)** — ## **🔹 Step 1: Sign Up for AWS Free Tier** 1️⃣ Go to [AWS Free Tier](https://aws.amazon.com/free/) 2️⃣ Click **Create an AWS Account** 3️⃣ Enter your **email, password, and account details** 4️⃣ Add a **payment method** (AWS Free Tier is free, but verification requires a card) 5️⃣ Verify your **phone number** 6️⃣ Choose **Basic Free Plan** — ## **🔹 Step 2: Launch an EC2 Instance (Virtual Machine)** 1️⃣ **Login to AWS Console** → Open **EC2 Dashboard** 2️⃣ Click **Launch Instance** 3️⃣ Choose an **Amazon Machine Image (AMI)**: – **Ubuntu 22.04 LTS** – **Amazon Linux 2** (Best for AWS-native applications) – **Windows Server** (For Windows-based applications) 4️⃣ Select **Instance Type**: – **t2.micro** (FREE for 750 hours/month) 5️⃣ Configure **Storage (8GB default for Free Tier)** 6️⃣ **Create a Key Pair** (Download the `.pem` file for SSH access) 7️⃣ Configure **Security Group**: – Allow **SSH (port 22)** for Linux – Allow **RDP (port 3389)** for Windows 8️⃣ Click **Launch** 🚀 — ## **🔹 Step 3: Connect to Your EC2 Instance** ### **For Windows (Using PuTTY)** 1️⃣ Download **PuTTY & PuTTYgen** ([Download Here](https://www.chiark.greenend.org.uk/~sgtatham/putty/latest.html)) 2️⃣ Open **PuTTYgen**, load the `.pem` file, and save it as `.ppk` 3️⃣ Open **PuTTY**, enter your **EC2 Public IP Address** 4️⃣ In SSH → Auth, browse and add the `.ppk` file 5️⃣ Click **Open** and login as `ubuntu` — ### **For Mac & Linux (Using Terminal)** Run this command: “`bash
chmod 400 your-key.pem
ssh -i your-key.pem ubuntu@your-ec2-public-ip
“` 💡 Replace `your-key.pem` with your actual key file name and `your-ec2-public-ip` with your instance’s IP. — ## **🔹 Step 4: Manage Your EC2 Instance** ✔️ **Stop the Instance (Pause, No Charges for Compute Time):** “`bash
aws ec2 stop-instances –instance-ids i-xxxxxxxxxxxxxxxxx
“` ✔️ **Start the Instance Again:** “`bash
aws ec2 start-instances –instance-ids i-xxxxxxxxxxxxxxxxx
“` ✔️ **Terminate the Instance (Permanently Delete):** “`bash
aws ec2 terminate-instances –instance-ids i-xxxxxxxxxxxxxxxxx
“` — ## **🔹 Common Issues & Fixes** 🔹 **Permission denied (publickey) error?** ✅ **Fix:** Ensure your **key file permissions** are correct: “`bash
chmod 400 your-key.pem
“` 🔹 **Cannot connect to EC2 instance?** ✅ **Fix:** Check your **security group settings** and allow **SSH (port 22)**. 🔹 **No public IP assigned?** ✅ **Fix:** Enable **Auto-assign Public IP** during instance setup. — ## **🔹 Who Is This Tutorial For?** ✅ **Beginners** exploring AWS Free Tier ✅ **Developers** deploying web applications ✅ **System Administrators** setting up cloud-based servers — ## **🔹 More AWS Tutorials:** 📌 **How to Deploy a Flask App on AWS EC2** → [Watch Now] 📌 **How to Setup an AWS RDS MySQL Database** → [Watch Now] 📌 **How to Connect AWS EC2 with a Custom Domain** → [Watch Now] — ## **👍 Like, Share & Subscribe!** If this tutorial helped you, please **LIKE, SHARE, and SUBSCRIBE** for more **AWS, Cloud, and DevOps tutorials**! 🚀 💬 Have questions? Drop them in the **comments** below! — ### **🔹 Hashtags:** #AWS #EC2 #VirtualMachine #CloudComputing #AWSFreeTier #DevOps #Cloud #Linux #AWSCloud #SysAdmin Now you know how to **launch a free AWS EC2 instance** and start working with cloud servers! 🚀💻

Want to store and manage **Docker images** using **AWS Elastic Container Registry (ECR)**? 🚀 In this tutorial, I’ll guide you through **pushing, pulling, and running Docker images** with AWS ECR, step by step. By the end of this video, you’ll know how to: ✅ **Create an AWS ECR repository** ✅ **Push Docker images** to AWS ECR ✅ **Pull images** from AWS ECR ✅ **Run Docker containers** from an AWS ECR image — ## **🔹 What You’ll Learn in This Video:** ✔️ How to **set up AWS ECR** ✔️ How to **authenticate Docker with AWS ECR** ✔️ How to **push and pull Docker images** ✔️ How to run a **container from an AWS ECR image** — ## **🔹 Prerequisites** ✔️ **AWS CLI Installed** ([Download AWS CLI](https://aws.amazon.com/cli/)) ✔️ **Docker Installed** ([Download Docker](https://www.docker.com/get-started)) ✔️ An **AWS Account** ([Sign Up](https://aws.amazon.com/)) ✔️ Basic knowledge of **Docker commands** — ## **🔹 Step 1: Create an AWS ECR Repository** 1️⃣ **Login to AWS Console** → Go to **ECR (Elastic Container Registry)** 2️⃣ Click **Create Repository** 3️⃣ Choose **Public or Private** repository 4️⃣ Copy the **repository URI** for later Alternatively, create a repository using the AWS CLI: “`bash
aws ecr create-repository –repository-name my-docker-app
“` — ## **🔹 Step 2: Authenticate Docker with AWS ECR** Use the AWS CLI to log in to ECR: “`bash
aws ecr get-login-password –region us-east-1 | docker login –username AWS –password-stdin [aws_account_id].dkr.ecr.us-east-1.amazonaws.com
“` 🔹 Replace **us-east-1** with your AWS region. 🔹 Replace **[aws_account_id]** with your actual AWS account ID. — ## **🔹 Step 3: Build and Tag a Docker Image** If you have a **Dockerfile**, build the image: “`bash
docker build -t my-docker-app .
“` Tag the image with your ECR repository URL: “`bash
docker tag my-docker-app:latest [aws_account_id].dkr.ecr.us-east-1.amazonaws.com/my-docker-app:latest
“` — ## **🔹 Step 4: Push the Docker Image to AWS ECR** Now, push the image to your AWS ECR repository: “`bash
docker push [aws_account_id].dkr.ecr.us-east-1.amazonaws.com/my-docker-app:latest
“` Once uploaded, your image will be available in AWS ECR. — ## **🔹 Step 5: Pull the Docker Image from AWS ECR** On another system or EC2 instance, **pull the image**: “`bash
docker pull [aws_account_id].dkr.ecr.us-east-1.amazonaws.com/my-docker-app:latest
“` To verify the pulled image, run: “`bash
docker images
“` — ## **🔹 Step 6: Run a Docker Container from AWS ECR Image** Run the container locally: “`bash
docker run -d -p 5000:5000 [aws_account_id].dkr.ecr.us-east-1.amazonaws.com/my-docker-app:latest
“` 🔹 This command runs the container and maps port **5000** to your local machine. — ## **🔹 Common Issues & Fixes** 🔹 **Denied: requested access to the resource is denied** ✅ **Fix:** Ensure your AWS CLI is configured with `aws configure`. 🔹 **Error: authentication required** ✅ **Fix:** Re-run the `docker login` command to authenticate. 🔹 **Image not found when pulling** ✅ **Fix:** Double-check the **repository name** and **region**. — ## **🔹 Who Is This Tutorial For?** ✅ Developers working with **AWS & Docker** ✅ DevOps engineers managing **container registries** ✅ Anyone deploying **containerized applications** — ## **🔹 More AWS & Docker Tutorials:** 📌 **How to Deploy a Dockerized Flask App on AWS ECS** → [Watch Now] 📌 **How to Use AWS Lambda with Docker Containers** → [Watch Now] 📌 **How to Set Up Continuous Deployment with AWS ECR & GitHub Actions** → [Watch Now] — ## **👍 Like, Share & Subscribe!** If this tutorial helped you, please **LIKE, SHARE, and SUBSCRIBE** for more **AWS, Docker, and DevOps tutorials**! 🚀 💬 Have questions? Drop them in the **comments** below! — ### **🔹 Hashtags:** #AWS #Docker #AWSCloud #ECR #ElasticContainerRegistry #DevOps #CloudComputing #Containerization #Microservices #DockerHub Now you know how to **push, pull, and run Docker images using AWS ECR** like a pro! 🚀🐳

Master the essential programming concepts required for Cambridge A-level Computer Science with this comprehensive guide focused on VB.NET implementation. From fundamental algorithms like searching and sorting to advanced topics in Object-Oriented Programming and Abstract Data Types (ADTs), this course provides clear, practical explanations and implementations of each tested concept. This tutorial covers important programming aspects, including linked lists, binary trees, and practical applications of algorithms. Course developed by Moarz. ❤️ Support for this channel comes from our friends at Scrimba – the coding platform that's reinvented interactive learning: https://scrimba.com/freecodecamp ⭐️ Chapters ⭐️
0:00:00 Intro
0:01:16 Object Oriented Programming
0:32:50 Algorithms
1:55:26 Abstract Data Types 🎉 Thanks to our Champion and Sponsor supporters:
👾 Drake Milly
👾 Ulises Moralez
👾 Goddard Tan
👾 David MG
👾 Matthew Springman
👾 Claudio
👾 Oscar R.
👾 jedi-or-sith
👾 Nattira Maneerat
👾 Justin Hual — Learn to code for free and get a developer job: https://www.freecodecamp.org Read hundreds of articles on programming: https://freecodecamp.org/news

Master the essential programming concepts required for Cambridge A-level Computer Science with this comprehensive guide focused on VB.NET implementation. From fundamental algorithms like searching and sorting to advanced topics in Object-Oriented Programming and Abstract Data Types (ADTs), this course provides clear, practical explanations and implementations of each tested concept. This tutorial covers important programming aspects, including linked lists, binary trees, and practical applications of algorithms. Course developed by Moarz. ❤️ Support for this channel comes from our friends at Scrimba – the coding platform that's reinvented interactive learning: https://scrimba.com/freecodecamp ⭐️ Chapters ⭐️
0:00:00 Intro
0:01:16 Object Oriented Programming
0:32:50 Algorithms
1:55:26 Abstract Data Types 🎉 Thanks to our Champion and Sponsor supporters:
👾 Drake Milly
👾 Ulises Moralez
👾 Goddard Tan
👾 David MG
👾 Matthew Springman
👾 Claudio
👾 Oscar R.
👾 jedi-or-sith
👾 Nattira Maneerat
👾 Justin Hual — Learn to code for free and get a developer job: https://www.freecodecamp.org Read hundreds of articles on programming: https://freecodecamp.org/news

Master Python from scratch 🚀 No fluff—just clear, practical coding skills to kickstart your journey! ❤️ Join this channel to get access to perks:
https://www.youtube.com/channel/UCWv7vMbMWH4-V0ZXdmDpPBA/join 🚀 Want to dive deeper?
– Check out my Python mastery course: https://mosh.link/python-course
– Subscribe for more awesome Python content: https://goo.gl/6PYaGF ✋ Stay connected:
– Full Courses: https://codewithmosh.com
– Twitter: https://twitter.com/moshhamedani
– Facebook: https://www.facebook.com/programmingwithmosh/
– Instagram: https://www.instagram.com/codewithmosh.official/
– LinkedIn: https://www.linkedin.com/school/codewithmosh/ 📖 Table of Content
0:00:00 Introduction
0:00:56 What is Python?
0:04:11 Installing Python
0:05:36 Python Interpreter
0:07:30 Code Editors
0:08:49 Your First Python Program
0:12:25 Python Extension
0:14:26 Linting Python Code
0:18:40 Formatting Python Code
0:22:51 Running Python Code
0:24:30 Python Implementations
0:26:59 How Python Code is Executed
0:29:45 Quiz
0:31:17 Python Mastery Course
0:31:44 Variables
0:34:48 Variable Names
0:37:51 Strings
0:43:20 Escape Sequences
0:46:01 Formatted Strings
0:48:09 String Methods
0:54:03 Numbers
0:56:50 Working With Numbers
0:58:59 Type Conversion
1:04:03 Quiz
1:06:43 Comparison Operators
1:08:46 Conditional Statements
1:12:56 Ternary Operator
1:15:04 Logical Operators
1:19:07 Short-circuit Evaluations
1:21:13 Chaining Comparison Operators
1:22:35 Quiz
1:24:18 For Loops
1:27:56 For..Else
1:30:42 Nested Loops
1:33:26 Iterables
1:36:34 While Loops
1:41:33 Infinite Loops
1:43:10 Exercise
1:45:13 Defining Functions
1:47:37 Arguments
1:49:57 Types of Functions
1:53:59 Keyword Arguments
1:55:59 Default Arguments
1:57:34 xargs #Python #AI #MachineLearning #WebDevelopment

Want to **push and pull Docker images** to and from **Docker Hub**? 🚀 In this tutorial, I’ll guide you through the **basics of Docker Hub**, including how to **upload, manage, and pull container images** from a remote repository. By the end of this video, you’ll know how to: ✅ **Push Docker images** to Docker Hub ✅ **Pull Docker images** from Docker Hub ✅ **Tag and manage images** properly ✅ Use Docker Hub as a **private or public repository** — ## **🔹 What You’ll Learn in This Video:** ✔️ How to **set up a Docker Hub account** ✔️ How to **push images** to Docker Hub ✔️ How to **pull images** from Docker Hub ✔️ How to tag Docker images correctly ✔️ How to manage private and public repositories — ## **🔹 Prerequisites** ✔️ **Docker Installed** ([Download Docker](https://www.docker.com/get-started)) ✔️ A **Docker Hub account** ([Sign Up](https://hub.docker.com/)) ✔️ Basic knowledge of **Docker commands** — ## **🔹 Step 1: Login to Docker Hub** First, log in to **Docker Hub** from your terminal: “`bash
docker login
“` Enter your **Docker Hub username and password** when prompted. 💡 If you’re using **two-factor authentication (2FA)**, generate a **personal access token** from Docker Hub instead of using your password. — ## **🔹 Step 2: Pull an Image from Docker Hub** You can pull an official image like **Nginx, Python, or MySQL**: “`bash
docker pull python:latest
“` To check if the image is downloaded, run: “`bash
docker images
“` This lists all **Docker images available locally**. — ## **🔹 Step 3: Build and Tag a Docker Image** If you have a **custom Dockerfile**, build an image and tag it for **Docker Hub**: “`bash
docker build -t yourdockerhubusername/myapp:1.0 .
“` 🔹 `yourdockerhubusername/myapp:1.0` is the image name and tag. 🔹 Always **tag your images** properly before pushing them to Docker Hub. — ## **🔹 Step 4: Push a Docker Image to Docker Hub** Now, push your image to **Docker Hub**: “`bash
docker push yourdockerhubusername/myapp:1.0
“` Once the upload is complete, visit **Docker Hub** to see your image! — ## **🔹 Step 5: Pull Your Image from Docker Hub** On any other system, you can **pull the image** and run it: “`bash
docker pull yourdockerhubusername/myapp:1.0
docker run -d -p 5000:5000 yourdockerhubusername/myapp:1.0
“` This downloads the image from **Docker Hub** and runs it in a container. — ## **🔹 Step 6: Manage Your Docker Hub Repository** To manage your repositories: 🔹 Go to [Docker Hub](https://hub.docker.com/) 🔹 Set images to **public or private** 🔹 Delete or update images as needed — ## **🔹 Common Issues & Fixes** 🔹 **Denied: requested access to the resource is denied** ✅ **Fix:** Ensure you're logged in with `docker login`. 🔹 **Error: unauthorized: authentication required** ✅ **Fix:** Check your credentials and re-authenticate. 🔹 **Image not found when pulling** ✅ **Fix:** Double-check the repository name and tag. — ## **🔹 Who Is This Tutorial For?** ✅ Developers working with **Dockerized applications** ✅ DevOps engineers managing **container registries** ✅ Anyone starting with **Docker containerization** — ## **🔹 More Docker Tutorials:** 📌 **How to Build & Run a Flask App in Docker** → [Watch Now] 📌 **How to Deploy Docker Containers on AWS ECS** → [Watch Now] 📌 **How to Use Docker Compose for Multi-Container Apps** → [Watch Now] — ## **👍 Like, Share & Subscribe!** If this tutorial helped you, please **LIKE, SHARE, and SUBSCRIBE** for more **Docker and DevOps tutorials**! 🚀 💬 Have questions? Drop them in the **comments** below! — ### **🔹 Hashtags:** #Docker #DockerHub #Containerization #DevOps #DockerTutorial #CloudComputing #SoftwareDevelopment #Microservices Now you know how to **push and pull Docker images from Docker Hub** like a pro! 🚀🐳

Create an accessible, interactive memory game using React. This course takes you through building a polished project while exploring how to fetch data, manage state, and implement best practices for inclusivity and functionality. ✏️ Study this course interactively on Scrimba: https://scrimba.com/memory-game-in-react-c0a3odsk39?utm_source=youtube&utm_medium=video&utm_campaign=fcc-memory-game-launch Code is available on the Scrimba course page for each lesson. Discover how to build a fully interactive memory game in React, designed to enhance your development skills and with a focus on accessibility.
This course guides you through each step, from fetching and managing API data to designing reusable components and implementing user interactions.
You’ll work on challenges such as randomizing game elements, detecting matches, and handling errors. Along the way, you'll gain practical experience in solving common development problems.
Accessibility is a key focus of the project, with detailed guidance on ARIA attributes, semantic HTML, and designing for inclusivity.
This course is ideal for anyone looking to deepen their React knowledge while working on a meaningful, real-world project. By the end, you’ll have an accessible, polished memory game that demonstrates your skills and commitment to building user-friendly applications. Scrimba on YouTube: https://www.youtube.com/c/Scrimba Timestamps:
Building the Foundation 0:00:00 – Intro 0:06:00 – Boilerplate code 0:11:53 – Fetch data from API 0:17:18 – Store API data in state 0:21:19 – Aside: HTML entities 0:26:08 – Render memory cards with API data 0:30:45 – Issue with emojisData 0:33:29 – Get random emojis pt. 1 0:43:32 – Get random emojis pt. 2 0:49:32 – Duplicate and shuffle emojis Core Game Functionality 0:55:10 – Side note: Address future discrepancies 0:58:59 – Select a memory card pt. 1 1:05:22 – Select a memory card pt. 2 1:10:37 – Select a memory card pt. 3 1:20:16 – Detect matching cards 1:28:50 – Are all memory cards matched? 1:34:11 – Create EmojiButton component 1:42:58 – Identify selected & matched cards in MemoryCard 1:48:38 – Conditional memory card content 1:54:44 – Conditional memory card styling Accessibility Enhancements 2:04:33 – Disabled attribute & conditional event handler 2:12:01 – Aside: aria-label & aria-live 2:21:50 – Add aria-label to EmojiButton 2:31:00 – Side note: Renamed state variable 2:32:32 – Create AssistiveTechInfo component 2:41:29 – Aside: aria-atomic 2:47:52 – Make AssistiveTechInfo component accessible 2:50:46 – Create GameOver component 2:54:05 – Add button to GameOver component 3:02:07 – Accessibility issue in GameOver component 3:03:45 – Aside: Focus as an accessibility tool 3:14:14 – Make GameOver component accessible Advanced Features 3:18:11 – Identify error handling issue 3:21:10 – Handle errors with useState 3:26:52 – Create and render ErrorCard component 3:34:24 – Refactor App to use formData 3:42:18 – Create form elements 4:00:19 – Save form selections in state 3:57:44 – Refactor form pt. 1 4:05:15 – Refactor form pt. 2 4:12:13 – Improve accessibility of Form component 4:20:50 – Outro