Git add
git add puts changes in the staging area, ready for the next commit. It works for new files and for changes to tracked files.
Name the files you want, or use --all (or -A) to stage every change in the repository.
Stage one file
git add index.html
git status --short
A index.html
Stage all changes
git add --all
git status --short
A bluestyle.css
A index.html