Does trying to learning about knots get you all tied up? (Sorry about that.)
Dave Wooldridge from Ridge Wilderness Adventures recently released a short clip demonstrating the three key knots you will end up using 80% of the time. They are the Bowline, Truckers Hitch and the Half Hitch.
Finally, if you are looking for a fantastic online resource, look no further than Animated Knots. If they don’t have it you don’t need to learn it.