There are many tools and websites dedicated to training and teaching instruments, but Music Theory offers lessons to teach prompts, notes, times and symbols to learn solfeggio, ie read the scores.
After theory, you can always test knowledge through exercises, such as identifying notes, intervals, scales, and even chords. The same applies to the piano, to identify the notes of the instrument, and even to take the musical knowledge further to train the ear itself.
Finally, the website offers a variety of tools, from interval calculators, scales and chords, to utilities such as Tempo and even a functional piano to train notes and chords. These tools are also available in a smartphone application.
You can visit Music Theory at the following address.