## Summary:

`git add -A`
stages all changes

`git add . `
stages new files and modifications, without deletions (on the current directory and its subdirectories).

`git add -u`
stages modifications and deletions, without new files

**Detail:**

The important point about `git add .` is that it looks at the working tree and adds all those paths to the staged changes if they are either changed or are new and not ignored, ***it does not stage any 'rm' actions***.

`git add -u` looks at all the already tracked files and stages the changes to those files if they are different or if they have been removed. ***It does not add any new files***, it only stages changes to already tracked files.

`git add -A` or `git add --all` is a handy shortcut for doing both of those. This ***adds, modifies, and removes*** index entries to match the working tree.