You don't need to worry abou them all, but it's a great list to look through if you want to understand more about SEO.
Bonus: Google uses 200 different ranking factors, but some matter more than others. So before you get caught up in SEO wonderland below, download my checklist of the 10 most important ranking factors. I'll show you how to tap into these key factors so you don't have to work too hard. :)