You should know a list of knots if you're routinely on the river or out camping around the water. Maybe twenty five is a bit much but here's a list you should absolutely know.

Bowline
Round Turn and Two Half Hitches
Two Half Hitches
Rolling Hitch
Cleat Hitch
Double Sheetbend
Trucker's Hitch

That's just a VERY basic set of knots that I could teach you in an hour, of course it would take longer for you to memorize and learn when to actually use them. The Trucker's Hitch is how I tie my boat to my trailer...I don't need straps, everything on my boat is three strand nylon rope...which is actually what has always been used in boating/fishing.

On another note, all of my hooks are Snelled the old school way...best knot in the world for tying on a hook to main line or leader line. Sorry to turn this into a knot thread but I'm simply amazed at how many people claim to be outdoorsmen and know virtually zero about knots.