Regarding GameFAQs, it always saddens me to see the utter lack of detailed guides for newer games. Basically, once you move into the early-'10s, you get a couple quick hint docs, at most, and from circa 2014-onwards, it's a desert. You might be lucky to find a detailed guide for one of the 'big-name' titles, but for most (especially smaller) newer games, YT clips is all you have, and those suck horribly compared to a nicely laid-out document you can Ctrl+F into.
Depends on the game. They usually have them for JRPGs. The new ones are fancy HTML ones with embedded pictures and videos too.