All the knots you’ll ever need. If only learn one, learn the bowline. Of course the illustrations only really help you identify what the knots look like, not learn how to tie them. If you disagree, tie the “Cat’s Paw” and then pat yourself on the back for your seamanly prowess.
And remember this fact regarding the rules of the road: It’s never acceptable to go through the other boat regardless of who has the right of way.
“Four Short Blasts” (either meaning) is an appropriate reply to an offer of an extra helping of Mackerel Loaf.