Also, one I learned the hard way = the default settings won't stop you from killing an innocent; so while you are learning the keyboard signals = it is really good to change that setting to "can't harm innocents" so if you accidentally whip out your blade trying to jump around an NPC in your way or blow off a spell in the bank = you don't end up having the guards after you,
(but if you join the Dark Brotherhood; you have to revert that setting back to the default again, lol).