Setups other learners found interesting in Simple Pendulum Simulation. Try one, then tweak it.
A bob on a string swings back and forth about its lowest point. For small swings the motion is simple harmonic and the period depends only on the string length and gravity — not on the mass, and only weakly on the amplitude, the property Galileo called isochronism. Increase the initial angle to see the small-angle approximation break down.
A pendulum's period depends only on its length and gravity, not its mass: T = 2π√(L/g). The physics of the swing, energy and damping, with a simulation.
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