When you're new to lighting, it can be tempting to jump into complicated setups to try to achieve popular looks, but you might be surprised by just how much you can get out of one light. This great video discusses why it's important to stick with one light for a while while you learn the ropes.
Coming to you from Jeff Rojas, this great video talks about using a single light and why it's important to learn to really understand it before you move on to more complicated setups. There are many fundamental properties of light, such as falloff, size, and more that affect the appearance of the final image, and the behavior of each of these properties with respect to different parameters of the light source and how you use it may not be as clear when you introduce additional sources. By working with a single light at first and varying the aforementioned parameters, then reevaluating your final images, you can gain an intuitive feel for working with artificial light, and that feel will make you more confident and capable when you begin tackling more complex and nuanced setups. Check out the video above for Rojas' full thoughts.
A single light, large modifier, and a reflector are generally my go-to equipment list. Between switching up the reflector, grid, no grid, etc., you can produce an amazing variety of looks.
The natural light, the Sun, is one.
Draw the conclusions yourself ;)