My question here is mainly on how to most safely avoid bans. I'm well aware it is not 100% ever, however I want to do what I can. Currently I'm going to have all of my emunand and everything setup on my sd card that i just recently bought. I have a second sd i've been using for my switch for a while. If I stick to airplane mode and stay offline while using atmosphere and homebrew, and then switch to my other sd card and make sure everything is clean can I safely play online?
You always risk a ban on CFW if you go online on nintendo's servers with that console, no matter what anyone tells you, if Nintendo servers detect something is off and flags ya, you're basically screwed.
How to avoid being banned?
Have a secondary Stock Nintendo Switch with no CFW to play your legit games without fear online.
Don't connect to Nintendo servers under any circumstance on any console with CFW, always stay offline. [People do risk going online, but that's up to them, and all depends on what you're doing, if that makes you uncomfy, or you're unsure, then don't do it]
Don't pirate games and then attempt to play those games online, Nintendo will know you did not buy them and you'd be banned pretty dang fast.
If you pirate games, keep them on emuNAND only, you will dirty your sysNAND otherwise. If you don't know the diff, you should really go look that up now.
Don't hack/cheat/mod any online game and then attempt to play it online, if they detect that you gave yourself an unfair advantage, or that files don't match up, or seem modified in any way... then that's just asking for a bunch of red flags. But that goes for many consoles, not just the switch, so this one should be 100% obvious. lol
Lot's of these are pretty obvious, It suprises me that people still ask this question... If you have a modded console, you're obviously always at risk of being banned. XD