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Photography makes a great hobby. There has a low cost to get started taking pictures, and there are limitless options of things to take photos of. However, the two most important things you need to understand are F-stops and Shutter speeds.
F-stops are important because the choice you make here determines what the focus of your photo will be. Without getting to technical, an aperture ring is what determines the photos depth of view or depth of focus. Small F-stop values will have a narrow depth of view, and large F-stop values will have a wide depth of view. For example, F-stop 2.8 will focus on one object and leave everything else a blur in the background, but F-stop 22 will keep everything you see in focus.
Shutter speeds will determine how bright or dark your photo turns out to be. The shutter of a camera is not that different than a shutter on a window. The longer you leave the shutter open the more light you let in. In low light situations, using a slower shutter speed will make your picture bright. In bright sunlight, use a fast shutter speed to keep your picture from looking washed out and over exposed.