Answers

Ans 1.

GIT
Definition - A version control system for tracking changes in files and coordinating work on those files among multiple people.
Purpose - To manage and track changes in code locally on a computer.
Installation - Installed locally on a computer.
Location - Code is stored locally on the user's computer.

GITHUB
Definition - A web-based hosting service for version control repositories that utilize Git. 
            It provides additional features such as bug tracking, project management, and collaboration tools.
Purpose - To store and collaborate on code repositories online, with additional features such as bug tracking, project management, and collaboration tools.
Installation - No local installation required, accessed through the web. 
Location - Code is stored in the cloud on GitHub's servers.

Ans2.

git clone - This command is used to clone an existing Git repository from a remote location to your local machine.
git init - This command is used to initialize a new Git repository in the current directory.
git commit - This command is used to save changes to the local repository. It takes all the staged changes and creates a new commit with a message describing the changes.
git push - This command is used to send the committed changes to a remote repository, such as GitHub. This allows others to access and review the changes.
git add - git add command is used to stage changes in the working directory to be committed to the repository.

Ans3.

Fork the repository, Go to the repository on GitHub that you want to and click "Fork" button to create a copy of the repository
Clone the repository, Clone the forked repository to your local machine using git clone "URL of Repo."
Create a new branch, Create a new branch to keep your changes separate from the master branch using git checkout -b "branch name"
Make changes, Use git add (filename) to stage the changes and git commit -m "message" to commit the changes
Push the changes to the remote branch using git push origin (branch-name)
click the "Compare & pull request" button. Fill in a descriptive title and detailed description of your changes