Sometimes, you might want to delete all your local branches from a project. Doing it one by one might be very tedious when you have lots of branches.
Thus, with the command below, you can delete all your local branches except main:
git branch | grep -v "main" | xargs git branch -D
Of course, you can replace the main branch with any other branch.
Additionally, you might be interested in Git Aliases. The aliases will improve your experience significantly, and it is going to save you time as well.