how to discard git local branch changes?

If you have uncommitted changes that you want to discard, use this:

$ git reset --hard

which is equivalent to

$ git reset --hard HEAD

This removes all the local uncommitted changes. If you want to remove some offending commits from your local branch, try rewinding it:

$ git reset --hard HEAD^ #moves HEAD back by one commit

or e.g.

$ git reset --hard HEAD~3 #moves HEAD back by 3 commits

Use these with caution, as you won’t be able to undo these operations. Once you’re done cleaning up your local branch, use git pull to get the latest code.