Use this phrase when you want to make a comment on an action:
I don't like how Jared kept cutting you off in the middle of what you were saying. That's rude.
I was surprised by how they didn't check for our I.D. or anything when we got on the plane.
The entire phrase "how (sentence)" acts like a noun. This allows you to put it inside of other sentences:
I like that.
I like how you arranged all of the fruit in the shape of a face.