Git: An open source program for tracking changes in text files, it is the foundation for GitHub.
GitHub : a Web-based graphical interface for hosting repositories.
Repository: Contains all project files and documentation, as well as each file's revision history.
Clone: A copy of a repository that resides on your computer instead of on a website's server. It allows you to edit files offline and can sync the changes to the remote version.
Commit: An individual change to a file that has a unique ID so you can keep record of your changes.
Push: Sending committed changes to a remote repository .
Pull: Fetching in changes and merging them.
Branch: A parallel version of a repository contained within the repository that does not affect the master branch.
Merge: Takes changes from one branch and applies them to another.
Merge Conflict: An event where Git is unable to automatically resolve differences in code between two commits.
Fetch: Getting the latest changes from an online repository without merging.
Remote: A version of something that is hosted on a server.
References: https://techcrunch.com/2012/07/14/what-exactly-is-github-anyway/, https://help.github.com/en/github/getting-started-with-github/github-glossary, https://blog.axosoft.com/learn-git-merge-conflict/