I'm a knot junkie. I enjoy tying the best knot I can manage. The knots below are some of my memorized favorites. I have used all of them. You probably only need to know 6 knots to get any job done, but I have a hard time picking only 6.
BEND
•Butterfly (easy)
•Carrick (symmetric)
•Sheet / Double Sheet (Bowline family)
•Reef backed up with Strangle Knots (works on any different rope diameters)
•Zeppelin (symmetric)
BINDER MID-AIR
•Blake
•Gleipnir
•Tautline
BINDER AGAINST CONVEX OBJECT
•Bag
•Constrictor/Double Constrictor
•Constrictor ABOK #1253
•Jug Sling
•Reef
•Strangle (jams)
FISHING
(All these work w/ monofilament, braid and fluorocarbon)
•Arbor (line-to-reel)
•Berkley Braid (line-to-lure)
•King Sling (loop for free swinging lure)
•Palomar/Double Palomar (line-to-lure)
•Uni (bend or line-to-lure)
HITCH COMBINATION
•Marlin Spike
•Swiss Seat
•Trucker (great for making tension)
•Versatackle (great for making tension)
HITCH GRIPPING
•Adjustable Grip (good for making tension)
•Blake (good for making tension)
•Klemheist
•Prusik
•Well Pipe
HITCH NOOSE-TYPE
•Bull
•Buntline Slipped
•Girth
•Halter
•Hangman (for storing rope)
•Running Loop (e.g., Running Bowline)
•Siberian
•Strangle
•Timber
HITCH WRAP-TYPE
•Bag (better than Groundline)
•Getaway (kind of like Highwayman Hitch but better)
•Pile
•Round Turn and Two Half Hitches
•Sailor (super easy untie)
•Snuggle
LASHING
•Diagonal
•Square
•Transom
•Tripod
LOOP ON BIGHT
•Bell Ringer + Half Hitch to secure
•Bowline with Bight
•Bowline 3 Loops (tie whole loop on bight)
•Butterfly 1/2/3 Loops
•Double Dragon
•Karash Double Loop
•Span (great in Trucker Hitch)
LOOP ON END
•Bowline
•Bowline Birmingham 2/3 Loops
•Double Dragon
•Zeppelin
STOPPER
•Ashley
•Fig9
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If you're reading this, it's too late.