In the past I wanted to do the same because I have the same problem as you but I never actually gotten around to executing the learning part... The one resource that picked my attention the most is https://youtu.be/didXE0HkSC8 ("Learn Mathematics from START to FINISH (2nd Edition) "). It's a 37 minute video with dozens of book recommendations and how you should proceed with the order of those books.
I'd say it really depends on context so it can be anything. Sometimes it can even mean something positive if it's with a friend group for example. But if I were to think about the offensive context specifically I would go with 3. Personally I interpret the gesture as silent "fuck you" or "fuck off" which in itself is not that offensive either because of popular usage.
Let's take it a step further, a tile based feed where you can pick yourself what would you like to watch, wait...
I've been avoiding it for years and finally gave in in the moment of weakness. I uninstalled it very soon after because I hated the experience so much and never gave it another thought nor chance. xd
I miss being able to sleep and breathe.
Do you have any sources about this stuff? Looks like something interesting to read.
I don't know if that counts but fan translating comics/novels using machine translation WITHOUT DOING ANY PROOFREADING AFTERWARDS.
This is wild. Didn't knew gangs do shit like this.
Whitelist/allowlist for this region comes to my mind. But probably some other specific problems would arise from this too. Hmm...
Notepad# when?