Good question, I was a hobbyist photographer for at least 3 to 4 years. My mentor always talked about numbers when I had questions about photography, I did not understand back then. I now know that photography requires a lot of skills including mathematics, computer knowledge, and most of all, creativity. When you become a professional, the financial aspect comes into play, you will make photography packages, hire people, and run through your expenses/earnings all day. The camera has a lot of numbers like shutter speed, f-stops, ISO. These numbers will become a part of your reflexes, then you start working on speed lights and studio strobe lights, you buy a light meter which tells you the reading in numbers. Then you'll learn about golden ratio, sunny 16 laws, light and shadows. I suggest you should focus more on creativity and understanding your camera first, and as you progress, keep focusing on the details and nitty-gritty of photography.