If you want to talk about football, use the Pure Football forum.
If you want to talk about politics, use the Politics sub-forum of the SMB board.
If you want to talk about random things in the news or life in general, ask for help with things in everyday life or talk about TV, films and music, use the SMB forum.
If you want to talk rubbish, post pictures of women in bikinis or play counting games, post in Parsnip forum.
If you want to talk about computer games or gambling, use the Games and Gambling forum.
Don't be overly abusive, don't post anything libellous, don't post porn, don't break any laws, don't post any personal information about yourself or others, and you'll be fine.
Oh, and the standard greeting on here for new posters is "Fuck off Toon Toon".