Weirdly one of my favorite things is tying the hook to the line. Something about fishing knots is just interesting. Such a simple thing can have a lot of complexity, there are even knot tying competitions out there.
I'm a fan of the uni-knot, but I don't go often so it's nice to have one relatively easy knot to remember. Also use it to secure rope to a clasp for a dog leash, or just in general when tying a rope to something that I don't need to remove easily.