I want to teach myself photography, but I don't know where to start.

First, go to the bookstore and choose an introductory book. Zheng Rensheng's General Photography and Lei Yili's Digital SLR Photography Bible are both good introductory textbooks in China. Buy another camera, preferably a SLR, at least a camera with full manual function. Read the basic knowledge part of the textbook first, and then explain it to the camera after understanding the basic knowledge of photography, and master all the corresponding functions of the camera. Then you can shoot, for example, a group of photos with different focal lengths, different shutters and different apertures for the same scene to understand the concepts of perspective and depth of field.

After mastering the basic knowledge, you can read some classic photography textbooks and photography art theories. New York Institute of Photography is a must for photography textbooks. You can also read some photography magazines. Personally, I think China Photography and Photography World are the best. After you have your work, you can join a forum or start a blog to communicate with your peers online.