What non-technical content do/did you research the most as a game dev?

For me, it's marketing strategies and tips - I still sometimes search in vain for that one magical guide that will make perfect sense. On some days I feel great about marketing, on most days I still feel like I have no idea what I'm doing : )

I'm curious, what else do other game devs keep searching for? Maybe business, analytics, also marketing, or something else?

I've been meaning to move our blog to our game studio's site and would like to know if there are any helpful topics we could write about from experience. I like the idea of giving suggestions with our own games/experience as examples, to give more context of any advice.