>>920685Just ones I use often:
Figure 8 (and variations)
double half-hitch
Palomar knot
surgeon's knot
double uni knot
eye splice
square knot
There are tons of other great knots in this thread. Remember that the type of line, rope or cordage AND the material it's made out of AND its diameter AND (sometimes) environmental considerations all affect a knot's strength and reliability. For example, the best climbing knots are usually not the best fishing knots, the best monofilament knots are not the best braided line knots, the best knots for Manilla are not always the best knots for synthetic kernmantle ropes, etc.
Something that's not knots, but related and super useful to know are tangle-free ways of wrapping rope and cord, as well as how to make quick deployable/release cordage. The butterfly coil (and variations) is super useful, as is the crossing-over "fast rope" wrapping method (I don't know if it has a universal name). The chain sinnet can also be useful. Being able to wrap so that you can deploy any length of rope instantly with no snags should be one of the first 5 things taught to anyone learning knots.
Also learn the Swiss seat. It comes in really handy every once in a while
