Welcome! This is a great instance, but don't forget to check out communities on all instances. I start by viewing by all, and then when you find a community you like, subscribe to it. Sometimes there are duplicate communities on different servers. You can subscribe to all/both and the widdle down the ones that are most active or the ones you prefer to participate in. Once you got a good set of communities that you are subscribed to it is easier to avoid the things you don't want to see.
Generally people are very friendly if you have questions. You can attempt to look for an answer to your question that may already have been posted in various communities or posts, but at the moment it is a bit difficult to search for individual questions amongst the entire federation and various instances.
Try out one of the apps. I am an android user and prefer Sync, Connect, and Voyager. iOS has Memmy and a few others I am not familiar with. I find it easier to maneuver around Lemmy with an app but the default browser UI works just as well.
Enjoy!