The upvote button! It should at least remind you how much voting power you have atm, and remind you it will decrease.

Generally speaking the most similar experience new users (as myself) have using social media is fb, or tw, or maybe ig, where liking is free. If I read somewhere that I can get rewarded for upvoting, I'll just do it everytime I can -- I actually did, the first time I got into Steemit.

It would be awesome to fully understand the dos and don'ts before you start liking anything.