There aren't really that many "rules" like Facebook and such. Don't copy stuff that's not yours, tell the truth, don't offend... Common sense things, really.
https://www.steemithelp.net/#/etiquette/
For answers to other questions try this:
Welcome, and have fun!
ooh thanks a lot you are very nice
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thanks you are very nice
Downvoting a post can decrease pending rewards and make it less visible. Common reasons:
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