If like me, you occasionally use Sourcetree or similar Git GUI to quickly change branch, after a while you may find yourself with 200 branches in the left side, making this task a lot harder (and making you wonder why you’re not just using the command line!).
A quick remedy to this is to run:
git branch -d $(git branch --merged)
This rids you of any branches that have been merged, leaving you with a nice clean branch list.
If you then find yourself with a large pile of branches you never pushed to remote and merged (and indeed never will), you could then run:
git remote prune origin
This will remove any branches that are only on your local. Make sure you push whatever branches you’re working on first though!