Here are several important knots you need to know
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Animated Knots

Bowline Knot:

Clove Hitch (Rope End Method):

Clove Hitch (Open End):

Handcuff Knot:

Figure 8:

Figure 8 Follow Through Loop:

Double Figure 8 Loop:

Figure 8 Directional Loop:

Figure 8 Bend:

Sheet Bend:

Water Knot: