This list is by no means all encompassing. These knots aren't the complicated decorative knots you use for creating sexy wearables, but these are the knots I use and trust for functional, structural bondage in nylon.
Larks Head - a simple slip knot (aka trailing hitch, cow hitch, or running eye) that allows a reverse tension start to a tie. It WILL tighten up unless you combine it with a half hitch.
Half Hitch - a simple way to stop a lark's head reverse tension from tightening up. Great way to "stop" the rope before continuing on with another part of the tie. Lew Rubens rope cuff is built off these two.
Hair Tie - Combining a lark's head with a half hitch makes a secure, and functional hair tie, ala Lew Rubens.
Collapsed Lark's Head / Square Knot
Collapsed Lark's Head / Square knot. A great way to extend a rope when needed.
Granny & Square Knots
Granny & Square knots. I use these with a "split and tie" when security is not essential, and the rope won't be under direct tension.
Overhand Knot - Super simple. One of the few knots I trust to tighten when I need secure knots under tension.
Sommerville Bowline - I've been using this as my primary single limb (one column) / rope cuff for about three years now with very satisfying results. It's quick to tie, secure, zero pull throughs, and easy to untie in a hurry. Not every bowline is stable with nylon. Use what you like, but be sure to test it before you depend on it.
Farrimond Friction Hitch
Farrimond Friction Hitch - this little mouthful changed my game. It's an exploding, adjustable knot that's stable with nylon. (#MindBlown!!) For tough ties and predicaments, I'd rather have this knot than a safety cutter.....but still, always have a safety cutter. Just sayin'.