I have done a GIT Stage from Visual Studio accidentally. There are some files which I don't want to commit. Therefore I want to undo my Stage action and get my local changes back.
The reverse action is
git reset -- path/to/file
It'll unstage this file but actual changes in the file are kept, they now appear as "unstaged changes".
You can also add multiple paths separated by spaces
git reset -- path/to/file some/other/path/*
The nuclear option (unstage everything) being the very concise :
git reset
Some examples from the doc :
To reset a single file, here.
To reset multiple files, there (although for this one you don't need their step (4) which is very specific to the context).