YO YO! Welcome!
The best way is to go and check out the communities and see what you like. Then you can create posts in those communities.
Don't spam, don't abuse the system, don't copy-paste anything, source pictures if they are not yours, ...
For more exposure, check out other posts, engage with comments and have fun!
Peace yo ;)
Nice to meet you bro🙂🙂🙂