How does Xiaobai learn photography?

Just describe it and buy a second-hand entry SLR. 2k or so, in a box. Then read the instructions and practice after them. Read the instructions, practice for a few months, burn a few W shutters, be familiar with the operation, and have a certain understanding.

The camera manual is the best introductory textbook, and there is no one. I suggest you have the perseverance to read it and have a picture.

Other methods are not recommended, such as buying a third-party training course. No explanation is the most direct.

If you don't understand, keep asking. If you are satisfied, please adopt it.