I want to be a photographer, but I know nothing. What should I do?

It's simple. First, you have a camera, and you need a SLR. Second, take a camera and shoot whatever you see. If you shoot too much, you can compare the good with the bad. Third, consult more experts and read more textbooks (a lot of online search). Fourth, summarize and reflect, look at the works of masters, and look at other people's angles, speeds and apertures!