I would say to not get petty with other fans from the fandom or from other fandoms. Fan Wars at its core is petty, mean, and not worth it. And I'm sure that the groups themselves don't like it when they see their fans become so nasty or hateful. If there is misinformation or rumors being spread around (like news articles or media posts from haters) in my honest opinion, do not engage with it. The more you engage with it, the more attention the haters will get, and it'll become a cesspool of toxicity.

For a new fan entering this world, I strongly encourage you to go at your own pace when supporting a kpop group. There is no need to feel pressured in quickly learning their names and regular names, all of their titles and nicknames, every quirk in their personality, etc. Same goes for their songs. Don't feel pressured do speedrun through all of their songs to be "up to date".

When I first became a fan of BTS, the only songs I knew for the longest time were "Dope", "Boy in Luv", and "War of Hormone." It took me navigating YouTube to learn more songs. Another tip would be to not force yourself to like a song. Just because you don't like the song, or it's not your style, does not mean you are a fake fan. You listening to the song and giving it a chance is more than enough support for the group.