PSA: At least learn your champ.

Even though this may sound easy, i've legit had people who don't know what their own champ does. Not just like use the ability wrong, they actually have no idea what it does. Example: I once had a kallista who didn't know what rend did, and we lost baron because of it. All you have to do is just read like a couple sentences and that's it. Anyone else experienced something like this?