Answer by jtheletter for How do I discard unstaged changes in Git?

If you merely wish to remove changes to existing files, use checkout (documented here).

git checkout -- .

• No branch is specified, so it checks out the current branch.
• The double-hyphen (--) tells Git that what follows should be taken as its second argument (path), that you skipped specification of a branch.
• The period (.) indicates all paths.

If you want to remove files added since your last commit, use clean (documented here):

git clean -i 

• The -i option initiates an interactive clean, to prevent mistaken deletions.
• A handful of other options are available for a quicker execution; see the documentation.

If you wish to move changes to a holding space for later access, use stash (documented here):

git stash

• All changes will be moved to Git's Stash, for possible later access.
• A handful of options are available for more nuanced stashing; see the documentation.