Why is the battery,door and brake warnning lights are on

Bad door switch, dose your dome light go out when you close the door? brake light can be a tail light out, put 4way flashers on and see if on doesnt flash. but most common is low brake fluid in the reserve. if its not low a common problem is its sensor an easy fix the replace comes with a new cap just unplug the 2 wires on wireline and plug in the new . battery light comes on if the battery is low or if the alternater is bad . jump the car, once running disconnect the neg. battery terminal if the engine stops the alternater is bad if not get the battery tested