Photos have some parameters. Why should they be marked?

Hello, it is marked for people to imitate and learn. Those photos are basically excellent, which can help learners get some useful and beneficial information in their future photography life, thus further improving our photography technology. Generally, the model, focal length, exposure compensation, sensitivity, shutter speed of the lens and its camera are indicated, and some even indicate the shooting location. Mainly for reference and study.

Hope to adopt ~ thank you