TIP 1

If you want to delete a branch and switch to another one and you have a problem like:

error: Untracked working tree file '...' would be overwritten by merge.

the following solution may help

git add .

git commit -m "You are gonna be deleted!"

git checkout next

git branch -d branch_to_delete

TIP 2

If  I want to delete a local branch and a remote:

git branch
git branch -d layout_for_demo1
git push origin :layout_for_demo1

TIP 3

If I want to delete a remote that is not on my local repo:

git remote show origin

git push origin :remote_to_delete

…more to come…