is it worth studying the flank openings, scotch and center game (and danish gambit)?

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I felt not not just a week ago. But playing stockfish online has me cranking the old gourd too hard at level 4 where stockfish seems to suddenly become aware of pawn placement. I recently looked at a Pandolfini book and played those openings on a physical analysis board. Not actually playing through any game, but just making the moves and looking. Well, when stockfish does anything scotch like, I'm able to erect a pawn structure that is a bit more than dismal which allows me to tactic a win. So a qualified yes.

If you play e5 then yeah.

there's always something to learn in each opening. it's more important however to focus on the opening principles. also systematic approach is very important, or you'll find yourself overwhelmed by bunch of theoretical moves.

Studying any opening is certainly not worth it at the 400 rating level, where you have a lot more profitable things to learn instead of openings. Like, for example, basic endgames.

So the next time when you are completely winning in an endgame, you won't just stalemate your opponent instead. See the end of this game:

you didnt have to call me out like that especially with the game damnnn

I did not "call you out", I gave advice. It's good advice, but of course feel free to ignore it.

its fine dw ill follow it

ok

I say anyone no matter the elo should do some learning on openings. At least the first 3-5 moves. I wouldnt call it studying but learning the right moves will be helpful even at 400 elo. Just do the basic lessons on chess.com. Watch one opening day.