How can I learn how to play a glissando on the piano?

To learn how to play a glissando on the piano, practice sliding your fingers smoothly across the keys from one note to another, maintaining a consistent speed and pressure. Start with a simple glissando from one octave to another, then gradually increase the distance and complexity of the glissando as you become more comfortable. Remember to keep your fingers relaxed and use a fluid motion to achieve a smooth and seamless sound.