Steps for git

1. Always pull a project before modifying it. Otherwise you'll have modification conflicts when tryint to push.
2. After pulling, modify everything you need.
3. Stage all modifications. You can achieve this with command using git add file to stage file, replacing 'file' with the file you've modificied. You can also use git add . to add all modified files.
4. Commit your changes. This is achieved in command with git commit -m "Commit message", using a message that explains why you've committed these changes (no need to write the actual changes)
5. Push changes to remote repository. This is achieved in command using git push and you may need to enter your username and password for github.