What new fans should know?

Hi everyone,

I’m German, baseball is not big here. Anyways I got into watching it recently, read the Wikipedia sites of each team and chose to be a brewers fan because it’s the most likeable city/team for me. Is there anything regarding fan culture or common knowledge I won’t get of the internet? For example things you had to be in the stadium to know. Thanks everyone, pls delete if irrelevant.