DEOBI 101: any unspoken rules?

I've been meaning to ask this question. Are there any unspoken rules within the fandom? Such as what fans call members if they don't use their stage names, fandom dynamics, etc. Just a DEOBI 101 as I'm ready to interact with others. Off of the top of my head of what I mean is how SEVENTEEN's THE8 is usually never called that by fans (Minghao instead) so if there's anything similar in DEOBI land please share :)