Tell Emacs never to insert Tabs

Question

I know how I can make it so that hitting doesn't insert a tab, but spaces.

However, Emacs keeps using tabs for indentation, like:

space space
space space space
tab tab space space
tab tab tab space space space

It's a messy mix, how can I configure it so that it never inserts tabs, for anything?

Answer 1

Add this to your .emacs:

(setq-default indent-tabs-mode nil)