Katara is a main character in Avatar. She has the ability to manipulate water and she was able to teach Aang waterbending.
Katara is skilled in manipulating water. She can take the water as a medium and use it to attack her targets at varying distances. In season one, she was able to fight on the same as an expert in waterbending. She is skilled enough to teach Aang waterbending so that eventually he could master it. She is also a skilled in martial arts as she can defend herself in battle against her enemies.