If you want to say that someone's dancing is good in Engpsh, you can say that they dance well or that they have good dancing skills. For example, you could say "She dances well" or "He has good dancing skills." Another way to comppment someone's dancing is to say that they have a good sense of rhythm or that they move gracefully. For example, you could say "She has a great sense of rhythm" or "He moves gracefully when he dances."