How to animate seperate body parts

I could not find one tutorial on how to animate separate body parts of a character. I want to have all the different parts of a character in unity and have them move without having to have a bunch of premade sheets of the character in different stances. Could someone explain how or direct me to a tutorial?

 

You can have each bodypart be a separate child gameobject with a spriterenderer, and you can use the Animator to animate each one of these objects separately.