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The hardest thing to learn in piano can vary depending on the individual student, but some of the most common challenges include:

1. Reading Sheet Music: This is the primary means of learning and performing piano, and it can be quite complex given the multiple lines and clefs. It requires time and patience to master.

2. Hand Synchronization: Playing the right notes with both hands at the same time can be quite challenging, especially when the rhythm and tempo are fast. It requires a high level of coordination and practice.

3. Fingering: Playing the correct keys with the correct fingers is also a skill that takes time to develop. It’s important to use the right fingering to ensure efficient and effective playing.

4. Playing Chords: This is particularly challenging for beginners. It involves playing multiple keys at the same time with one hand, which can be quite difficult to coordinate.

5. Master