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There is a large variety of knots, each with properties that make it suitable for a range of tasks. Some knots are used to attach the rope to other objects such as another rope, cleat, ring, or stake.
Some knots are used to bind or constrict objects. Decorative knots usually bind to themselves to produce attractive patterns.
This is the ultimate reference site for how to tie any knot you can think of (and some you can’t). Not only does each knot have its own animated how-to video, but there are also additional details such as background and uses. This is by far the most informative site on the internet for learning to tie knots.
As Grog says, “Better to know a knot and not need it than need a knot and not know it.”