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Tones and semitones
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The keyboard looks badly designed. Seven white keys, five black ones, spaced unevenly, with two places where the black keys just stop.
It is not a mistake. That irregularity is the reason , and all exist, and this lesson is where it starts to make sense.
Look at the black keys: groups of two and groups of three, over and over. That pattern is how anyone finds their way around without counting from the end.
Play with your computer keyboard too: Q W E R T Y U I O P is the left hand and Z X C V B N M , . / the right, an octave above, with sharps on the row above each.