Find out which keywords you could rank on page 1 for (realistically).
SEO is when customers type something into Google and you show up. It's basically free money. The problem is, everybody else is trying to do the same thing, so it can be bloody difficult!
The key is to find keywords with high monthly search volume but low difficulty (not a phrase that's so competitive you'll never rank).
These are what's called long-tail keywords. They are more specific and usually longer than more commonly used keywords. They have lower search volume, but they can pay off big!