The Piano Keyboard Layout

How are the black keys arranged across the keyboard?

The black keys repeat in a pattern of a group of two followed by a group of three.

Why are the black-key groups so useful?

Because every white key looks the same, the black-key groups act as your map and landmarks.

A group of two black keys is always followed by a group of…

The keyboard alternates: a group of two black keys, then a group of three, over and over.