Learn a few basic knots..
It’s useful to know a bit of knots before the voyaging – knots are core skills in boating, like is navigating. These few knots are the very basic knots that will help you on board:
Figure 8 (stopper know for ropes)
Round-Turn & Half-Hitches (i.e. for fenders)
Three Simple Knots PDF by Jasper
Ten Mariner School Knots PDF by Jasper