The equilibrium point of a pendulum is when it does not oscillate and is quite stable. It does not count if you interfere with the movement of the pendulum (eg.: by holding it).
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The amplitude of a pendulum is the distance between its equilibrium point and the farthest point that it reaches during each oscillation.
amplitude
The length of the pendulum is measured from the pendulum's point of suspension to the center of mass of its bob. Its amplitude is the string's angular displacement from its vertical or its equilibrium position.
The longer the length of the pendulum, the longer the time taken for the pendulum to complete 1 oscillation.
A longer pendulum will have a smaller frequency than a shorter pendulum.