Open Thread: how do you look for information?

There have been a cou­ple dis­cus­sion posts on this, but let’s make it gen­eral and col­lect our tips in one place. It’s also a good way to en­courage each other at get­ting bet­ter at this—look­ing for info more of­ten and more effi­ciently.

So, if you want to find some­thing out, where do you look, and how? Who do you ask?