I’m currently interested in learning knots, because it seems like a useful skill.
There are a few categories of knots that I know of:
bends : join two pieces of line
end loops : put a loop at the end of the line (e.g. bowline)
hitches : tie onto a stable structure
mid loops : It.. uh.. puts a loop.. in the middle.
quick release : easy to undo
slide & grip : Can slide it along and it’ll hold, like a tent tensioner
splicing : Unlike bends, this makes two ropes a single rope.. not join two separate ropes (e.g. it’s like weaving the fibers together)
stoppers : end to the rope which prevents it from pulling through