There are many lighting setups that give you a different effects. When choosing how many lights to use in a scene you need to first look at the subject. You need to chose what it is you are trying to portray in a photo. If you are going for a professional photo that you would use for a work place you would want to take a photo with equal lighting.
Incandescent, Fluorescent, Studio Strobe and LED are some of the types of bulbs that are used in the light stands. Most cameras have a built in LED light that the user can use. Large camera such as the Cannon 750D can connect to an external flash and can fire the flash from a remote place this gives the ability to use multiple flashes in one shot. In the below shot you can see the effect of multiple lights give to the highlights in the shots.
Another way you can produce a similar effect is by using a reflector which can be used to bounce light of one source to another. You can see below a shot, the light that is set up to the right of the subject and a reflector set up on the left.