#### Cleaning

Show informations about remote branches:
$ git remote show origin

Stop tracking deleted remote branches:
$ git remote prune origin --dry-run


#### Remote tracking

Verify origin and upstream setup:
$ git remote -v

If upstream is missing, setup:
$ git remote add upstream git@bitbucket.org:some-gatekeeper-maintainer/some-project.git

Collect changes of upstream repository:
$ git fetch upstream

Checkout main branch (master):
$ git checkout master
And continue usual workflow:
$ git pull upstream master || $ git merge upstream/master || $ git rebase upstream/master


#### Lost and found

Look to log for what you lost:
$ git reflog

Create new branch from what you found:
$ git checkout -b branch-name 70b3696


#### Unstage all local changes

To keep changes:
$ git reset HEAD

To remove everything not commited permanently:
$ git reset --hard HEAD