Programming

I use it as a search engine but not as my only source. It's really good at regurgitating the most relevant Stack Overflow answer I might find, which may or may not actually be applicable to my situation. As a rule I never copy paste code directly, I always rewrite it "in my own words", even in cases where it's basically the same. If the code it provides is more than 5 lines or so I can almost always think of a better way. I feel like I'd still be better off with a really solid reference manual though, and a recipe book. But they go out of date too fast these days.