Could be anything, honestly. Could be something like when to eco or when to force in a scrim, since there is personal gain (winning the match) for making a certain decision.
To, I dunno, this is mostly just an example because I don't feel like I know enough of it but, for instance flat earthers. Flat earthers are blatantly stupid and I'd like to argue with them and make them (hopefully) change their mind or at least make them look dumb. But I don't feel like I know enough about physics to really properly argue with them. But It's a subject that, if I had the knowledge, I could get passionate-ish about.
Also that transgender nonsense and SJW crap that's going on in the US and Sweden for the most part. I have some opinions on that where I feel like I do actually have enough knowledge to have a discussion about that. (Though the other party that I'd have a discussion with usually do get a "bit" more passionate about it than me, lol).
EDIT: so that's just 2 opinions in 2 different contexts. 1 Where I feel like I have enough knowledge (in most cases) and 1 where I feel like I can't engage in a discussion too much because I feel like I don't know enough about physics / the subject at hand.