Know your knots
One of our favorite online sailing resources is the website Animated Knots. Knowing your knots and being able to use them quickly when needed are essential sailing skills. These include the bowline, the figure 8, the clove hitch, the sheet bend, the rolling hitch and of course, the cleat hitch. How many of these can you do?
Practice makes perfect, and this resources makes it easy: https://www.animatedknots.com/