What are your “places to search other than Google” when programming?

Google doesn't get you to everything on the web.

There's lots of other places to search when you're wanting to find stuff, especially for programming.

For example, you might want to know about state machines....... in fact the best place to find great examples is searching on codepen.io

Or you might find what you want searching the wayback machine.

Or you might be better searching github.com

So my question ..... where else are fabulous nuggets found apart from google?