Step-by-step explanation:
Piano is the best instrument for many reasons. First, it is somewhat easy to learn. This is important because if younger kids want to learn an instrument, piano is one of the easiest for them. Secondly, piano goes great with many other instruments. This is important because if you want to play in a band, piano is almost always included. Lastly, you can make your own songs. Yes, you can do this with other instruments but it most commonly found with pianists. This is important because it allows you to express your creativity and its not too hard to do this on piano since it's easy to memorize. In conclusion, there are many great things about pianos.
(side note you can adjust this how you want :D)