のが上手

「のが上手」indicates that someone is good at doing something. This is expressed by placing a verb before 「のが上手」. The particle 'の' functions to turn the verb into a noun.
Note: Because「のが上手」is an evaluation of someone's skill based on the result of their actions, and this evaluation comes from others, it is objective. Therefore, if one were to self-assert that they are '上手' at something, it might come across as arrogant. In such cases,「のが得意(とくい)」can be used instead. On the other hand, if one feels they are not good at something, they can still use「上手じゃない」.