Black keys on a piano are half a tone higher/lower than the white keys next to them. They should sound the same wherever you hit them, because it is the same note throughout the black key.
While they have two different names, they are still the same note – the different names are used depending on the context. So C# and Db are the same note.
The black keys are typically used in different scales – C major is the scale that most beginners use, as it has no sharps or flats and only uses white keys. G major has one sharp (F#), and F major has one flat (Bb). If you want to learn more about scales, I suggest looking up the circle of fifths.
Hope this helps 🙂
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