Get an edge in communities
If you're racing in a community, pay attention to the rules. If you pay attention, you can get some ideas on what tracks to use. If it's mirror mode, try something that people get their brains messed up on, like Mirrored Mushroom Gorge; just make sure you don't get fooled. If only mushrooms are allowed, take a track with a lot of shortcuts that require mushrooms/stars, like Toad Circuit. If only shells are allowed, take a fast-paced course where boosts are seen often, like Rainbow Road, where you can also knock people out of the air with Spiny Shells. If it's 150 CC, take a track that you're good at (NOT MAKA WUHU).