Knots can be a sticking point for many new anglers. They don't have to be, despite all the fancy names you can get away with 3-4 knots for 99% of your fishing. All are easy with a little practice and you may even know a couple already.
Your rod is assembled with a few different types of knots, the various knots play a role in mostly the leader lines connection and fly to tippet connection. Here's the lineup of knots from backing to the fly and hopefully helpful instruction on how to tie them.