Most Lemmy etiquette is pretty easy to follow. Just check the sidebar for rules before you post or comment. Etiquette is slightly varied among instances, but generally be nice and you’ll do fine. You may catch bans from communities you don’t participate in depending what you post, but try not to pay it to much mind.

Some instances or communities are explicitly heavily moderated (see Blahaj, Beehaw, and others) and preemptively ban people for comments and posts elsewhere. Most likely it’s nothing personal, and you wouldn’t have gotten much from those communities if you are posting counter to their purpose.

Other than that enjoy your time here!