To install Git on your local machine, follow the instructions for your operating system:

• Windows: Download the installer from https://git-scm.com/download/win and run it.
• macOS: Install Git using Homebrew by running brew install git in the terminal. If you don't have Homebrew, you can download the installer from https://git-scm.com/download/mac.
• Linux: Install Git using your package manager. For example, on Ubuntu or Debian, run sudo apt-get install git in the terminal.

After installing Git, configure your user name and email address by running the following commands in the terminal:

git config --global user.email "your.email@example.com"

These settings will be used for your commit messages.

To create your first repository on GitHub, follow these steps:

• Log in to your GitHub account.
• Click the '+' icon in the top-right corner and select 'New repository'.
• Enter a name for your repository, add a description (optional), and choose whether to make it public or private.
• Initialize the repository with a README file.
• Click 'Create repository'.

You can clone the repository using Gitpod or on your local machine.

• Gitpod: Visit https://gitpod.io/#https://github.com/yourusername/yourrepository and replace 'yourusername' and 'yourrepository' with your GitHub username and repository name. Gitpod will automatically clone the repository and open a new workspace.
• Local machine: Open the terminal and navigate to the directory where you want to clone the repository. Run the following command, replacing 'yourusername' and 'yourrepository' with your GitHub username and repository name:

git clone https://github.com/yourusername/yourrepository.git

4. Then, navigate to the cloned repository by running cd yourrepository.

To add a 'Hello World' file, commit, and push changes, follow these steps:

• Create a new file called 'hello_world.txt' in the repository.
• Open the file and add the text 'Hello, World!'.
• Save and close the file.
• In the terminal, run the following commands to stage, commit, and push the changes:

git add hello_world.txt
git commit -m "Add Hello World file"
git push

Your changes will now be visible on GitHub.

Follow the instructions in the Installing Git and Configuring Your Git Environment sections to install Git on your local machine and configure your user name and email address.

Follow the instructions in the Creating Your First Repository on GitHub section to create a new repository on GitHub.

Choose whether to clone the repository using Gitpod or on your local machine, and follow the instructions in the 'Cloning the Repository' section.

Follow the instructions in the Adding a Hello World File, Committing, and Pushing Changes' section to add a 'Hello World' file to your repository, commit the changes, and push them to GitHub.