Welcome fellow steemian, here's a couple of links that helped me understand steemit a lot, altought I still don't understand everything about it since I also recently started :) https://steemit.com/steemit/@calamus056/curation-rewards-explained-in-great-detail
https://steemit.com/faq.html
oh and I'm not using this to promote or anything, just sincerely trying to help out