This is absolutely one of my favorite shows of all time. I actually just finished rewatching it last week for the fourth or fifth time all the way through. I learn more every time I watch it. I think one of my favorites about it are the subtle ways in which the characters get better at their bending without really talking about it. It's not like Katara suddenly learns a new move and goes, "Hey, look what I can do!" There is a natural progression of their powers. In the early episodes she can barely make waves. By the end of the show she's skating around on ice and fighting people off with her water tentacles.