Piano Note Trainer
Learn the keys by playing a quick quiz: name the highlighted key, or find the note you're asked for. Start with one octave of white keys and add more when it feels easy.
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How to find any note on the piano
The black keys come in groups of two and three. C is the white key just to the left of every group of two, and F is just to the left of every group of three. From C the white keys go C D E F G A B, then start again. Middle C (C4) is the C closest to the middle of the keyboard — it's where this trainer starts.
A black key is named after its neighbours: the one to the right of C is C♯ (C sharp), which is also D♭ (D flat). When you know the white keys, switch on the black keys in the settings.
Next step: learn the scales or name the chords you play.