SHELL

git discard all changes command

git reset –hard		# Revert uncommitted changes in index
git clean -fxd		# Remove newly created files that not in index

git revert all local changes

git reset; git checkout .; git reset --hard HEAD; git clean -fdx; 
git fetch --all; git fetch --all --tags; git pull; 
git pull --recurse-submodules

git undo all changes

use "git restore <file>..." to discard changes in working directory
use "git restore --staged <file>..." to unstage