After knocking about here for a few months, here are some tips for other ex-bird site people:
Use hashtags, it's the main way to find people & for them to find you.
No algorithm, so it's not a competition. Favourite posts you like, but boost/reblog to help them reach a larger audience.
It's etiquette to use content warnings/wrappings. Content need not be triggering/sensitive, but something others don't want cluttering up their timeline
Add text to images