Arborist Knots- This is the one skill that just may save your life one day. Don't put it off. Learn them and do them every day(while you can) for several months, so it's in your muscle memory and you don't forget them. You can't trust that someone else is
I guess this is a boating knot. I remember it from Girl Scouts as "here's the tree with a rabbit hole next to it.the rabbit comes out the hole, goes around the tree and back down into the hole." That's how you tie a boating knot.