Become a Master
I use “should master” instead of “should know”, because these knots must be at the tip of your brain (and fingers) at anytime in any situation under any condition, and as we know, on a sailboat, conditions can be stressful and decisions need to be made quickly and with confidence. There is no time to wonder, “Hmm, what knot should I use here?” Practice your knots in their context. Know when to use what knots!
Practice
Mastery only comes with practice so practice and Master 1 or 2 knots at a time, then move on to more. Be able to do them with your eyes closed! Frontwards, backwards and upside-down. Don’t try to get general knowledge of a bunch of knots and then be stuck with, “oh ya, how does that knot go?” Become a MASTER of at least these 8 knots and then move on from there.