My personal list is the uni-knot, sheet bend(Along with the slipped and double versions), tautline hitch, alpine butterfly loop, highwayman's hitch, and clove hitch.

And of course the double slipped square knot. I always have trouble with it, the right over left and left over right steps slow me down trying to make sure I don't accidentally tie a granny. But once it's done it's really obvious to anyone how to untie it since it's a standard shoelace bow.

I think one of the coolest things is that most knots have a really obvious slipped version, once you know the base knot you can make sure it never binds on you.

I always hear the clove hitch is not the greatest though, so I'm never sure what to do. Gliepnir is my favorite replacement, but it's not easy to remember.