Infact, if you come up with a knot that isnt in that book, you have just made a new knot.
If nothing else, its good read while your laying a deuce.
Ive been sailing for about 10 years, and I only really use 4 knots. Bowline, Figure 8, Round turn and two half hitches, and a sheet bend.
Occasionally ill through a truckers hitch in there to tie the boat down
Ladder: tie a bowline with a loop about 4' across. Run through 2nd down rung from the top of the ladder, slide loop over top of ladder. It'll effectively larks-head the entire ladder. Use free end with a half hitch on one of the feet of the ladder if you need more directional control when raising.
Long straight objects (like a firefighter's pike pole) Clove hitch with a stopper knot on the free end at the base. Half hitch around object's top end. If sharp or ungainly, put the odd/sharp end going up first.
If you use a ladder with a halyard, it's a good idea to tie the halyard off after you raise the ladder's fly. Take the halyard and tie a clove hitch around the center of a rung at about waist level, finish with a overhand or half hitch for a stopper knot. If the dog's on the ladder fail, this provides a measure of safety that should at least provide enough time to be able to get off the ladder before it collapses.