Essential 6 Knots
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cleat hitch
bowline - loop arouond pole or post-easy loosen after load
clove hitch- and will hold-twist and push bitter end to untie
reef,reefing or square knot-under load,need pliers to undo
sheet bend
stop or stopper or figure eight-knot-knife to take apart
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Other Good Knots
rolling hitch (Magnus hitch) -attach fenders to rail-you can grab & move a rolling hitch anywhere on a line and it will hold in that position under load

round turn & two half hitches

timber hitch- tile round pole and will hold-twist and push bitter end to untie

half hitch 

double clove hitch-double protection

carrick bend

anchor or fishermans bend

Double sheet bend

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reef or square knot-under load,need pliers to undo
bowline - loop arouond pole or post-easy loosen after load
timber hitch- tile round pole and will hold-twist and push bitter end to untie
clove hitch- and will hold-twist and push bitter end to untie
double clove hitch-double protection
stop or stopper or figure eight-knot-knife to take apart
bowline
Ends of lines-Standing end is hanging from top mast, bitter end loose end [falls in water bitter end]

2 hitches-[attach a line to some other stationary thing ]
cleat hitch
rolling hitch (Magnus hitch) -attach fenders to rail-you can grab & move a rolling hitch anywhere on a line and it will hold in that position under load

2 knots-[attach a line to itself  ]
reefing or square knot

1 bend   [attach a line to another line  ]
sheet bend

a bit is a loop