Ah, knots....I'm a big knot fan since scouts....about 40 years ago.
I take a different approach. Knots are simply tools in my mental toolbox. I use what I know to be the best knot for the application AND rope/string/mono. Some of the knots mentioned are not universal to every kind of string.
If I picked a knot I find myself tying the most, it would be the "truckers hitch". I use it for tying up the garbage, chinching down my kayaks on the car roof, even as a poor-man's hoist. I find myself using a "highwayman's hitch" for tying to docks (light boat, low load). Clove hitch gets used often and can be 'compounded' with other knots for things like hammocks or lacing bamboo together. Tautline hitch for flys/tarps.
Don't get me started on fishing knots.