# Git And Github ### What is Git? --- #### Introduction to Git **Git** is a popular version control system used widely by developers and teams for tracking changes in code. Created by **Linus Torvalds** in 2005 and currently maintained by **Junio Hamano**, Git helps manage and collaborate on code effectively, enabling multiple developers to work on projects from anywhere in the world. --- #### Why Use Git? * **Tracking Code Changes**: Git records every change made to the codebase, helping track modifications and understanding the evolution of a project. * **Identifying Contributors**: Git tracks who made each change, so the contributions of every team member are clear. * **Facilitating Collaboration**: Git allows multiple developers to work on the same project without overwriting each other’s changes. --- ### What Does Git Do? Git’s primary functions help developers manage and maintain projects smoothly and are divided into a few main areas: 1. **Manage Projects with Repositories**: * A **repository** is essentially a project or folder managed by Git. It keeps track of every version of the files in that folder. 2. **Clone a Project**: * Developers can create a **local copy** of a project by cloning it from an online repository. This allows work to happen offline. 3. **Control Changes with Staging and Committing**: * Changes are **staged** (selected for addition to the repository) and then **committed** (permanently saved to the repository), giving developers control over what changes are added. 4. **Branch and Merge**: * Developers can create separate **branches** to work on different parts of a project or features simultaneously without impacting the main codebase. Later, branches are **merged** back into the main project. 5. **Pull and Push**: * **Pull**: Updates the local copy of a project with the latest changes from the main repository. * **Push**: Sends local changes to the main project repository so others can access the updates. --- ### Working with Git: Key Concepts and Workflow 1. **Initialize Git on a Folder**: * When starting a new project, initialize Git in a folder. This action makes the folder a **repository**, and Git creates a hidden `.git` folder to track all changes. 2. **Making Changes and Staging**: * Every time a file is changed, added, or deleted, Git detects it as **modified**. * To save changes, **stage** the files you want to add to the repository. 3. **Commit Changes**: * After staging, **commit** the changes to take a permanent snapshot. This lets you save specific versions of your code, with each commit creating a checkpoint you can return to if needed. 4. **Track and View History**: * Git enables you to view the full history of all commits, so you can see what changes were made and by whom. You can even **revert** to a previous commit if necessary. 5. **Efficient Storage**: * Git doesn’t create a new copy of every file with each commit. Instead, it tracks the differences, which makes it memory efficient and faster. --- ### Why Git is Popular * Over **70% of developers** use Git. * Git facilitates teamwork from any location, making it ideal for global collaboration. * Developers can track and view the entire **history** of a project, making it easy to review the evolution of code. * Git’s **revert feature** allows returning to earlier versions, making it safer to experiment with new ideas. --- ### What is GitHub? **GitHub** is a platform that hosts Git repositories, adding a collaborative layer on top of Git’s features. GitHub offers tools that work seamlessly with Git, helping developers share code, manage projects, and contribute to open-source projects. Acquired by **Microsoft in 2018**, GitHub is the largest host of source code in the world. **Remember**: Git and GitHub are not the same. Git is the version control system, while GitHub is a hosting service that uses Git. ### Installing Git and Initializing a Repository --- #### Step 1: Download Git Git is free to download and install. You can get it from the official Git website: * **Website**: [https://www.git-scm.com](https://www.git-scm.com) --- #### Step 2: Open the Command Line Interface To start using Git, we’ll work with a command shell. Here are the options for different operating systems: * **Windows**: Use **Git Bash**, which is included with Git for Windows. * **Mac & Linux**: Use the built-in terminal. --- #### Step 3: Verify the Git Installation After installing Git, open your command shell and check if Git is installed correctly: ```bash git --version ``` **Expected Output**: If Git is installed, the output will show the version number, like: ```bash git version 2.30.2.windows.1 ``` > Note: the version number depends on the current version you are installing, so this might differ from what you display on your system #### Step 4: Configure Git with Your Name and Email Every Git commit uses a name and email address to identify the contributor. Setting these globally will apply your details to every Git repository on your computer. 1. **Set Your Name**: ```bash git config --global user.name "YourName" ``` 2. **Set Your Email Address**: ```bash git config --global user.email "youremail@example.com" ``` 3. **Setting Name and Email per Repository**: * If you want to specify a different name/email for a specific repository, leave out the `--global` flag. * Run the command within the repository folder. --- #### Step 5: Creating a Project Folder Let’s create a new folder for your Git project and navigate to it: 1. **Create a Directory**: ```bash mkdir myproject ``` 2. **Navigate to the Directory**: ```bash cd myproject ``` * **mkdir** creates a new directory (or folder). * **cd** changes the current working directory to the one you created. --- #### Step 6: Initializing Git Now that you’re in the correct directory, it’s time to initialize Git in that folder. This command will tell Git to start tracking changes: ```bash git init ``` **Expected Output**: ```bash Initialized empty Git repository in /path/to/your/myproject/.git/ ``` * **Explanation**: This command creates a hidden `.git` folder within your project directory, where Git will store all version history and track changes. **Tip**: If you already have a folder you’d like to turn into a Git repository, navigate to it in your command line or right-click on the folder and select **"Git Bash here"** (for Windows users) to start working with Git immediately. --- #### Summary * **Download Git** from [https://www.git-scm.com](https://www.git-scm.com). * **Verify Installation**: Use `git --version`. * **Configure Name & Email**: Use `git config --global` [`user.name`](http://user.name) and `git config --global` [`user.email`](http://user.email). * **Create & Navigate to Project Directory**: Use `mkdir` and `cd`. * **Initialize Git** in the project directory with `git init`. --- With these steps completed, you’re now ready to start working with Git on your project! In the next lesson, we’ll cover **tracking and committing changes** to your Git repository.