Cello can also be divided into children's type and adult type, but girls must be at least 7 years old to learn cello, because people are too young, their arms can't reach the strings, and it is difficult to pull the bow with their right hand. As for the comparison between cello and piano, piano is actually more difficult from the perspective of learning well. I once answered a parent's question about the comparison between violin and piano. Same as your question. Learning cello means that you can't see the effect for a year and a half, but you can only hear Weng Weng's voice, and the piano begins to work faster.