I joined here a week back.. and here is what i learnt one should not do..
Don't follow the crowd. This includes -
-voting up because others are..
-Random comments on posts..
-Ask people to follow you..
Don't put too many posts..
Don't voteup immidiately on the post.. give it 2-3 mins.. this relates to curating
Don't throw your ego at comments or posts you don't like.. be logical in debates..
Don't copy paste.. steemcleaners will catch you.. i tested this explicitly
I hope this helps newbies..
Welcome and enjoy the freedom of expression with steemit in right spirit..