What are the healthiest nuts?

I'm an athlete i skate. i'm 5'2 and about 103 pounds.. and im going to try to take out all processed foods out of my diet. (i use protein bars ALOT for snacks) and i want to drop those and start eating nuts. My mom buys cashews and almonds. are these healthy? what are all the nuts i could eat? And yes i know to eat them in moderdation but how much should i eat daily?