What is the basis of learning professional ps?

Hehe, I don't think this needs any foundation. I taught myself. As long as you are interested, you won't be bored. Everything will be easy. It only took a week before and after learning ps. At that time, I just wanted to study. So I always sleep once every two days, for four or five hours, and spend the rest of the time at my computer. I don't think it's tiring to watch the tutorial for more than ten hours. It all stems from interest. Before learning ps, you have to understand the characteristics of several color modes. There are RGB mode, CMYK mode, HSB mode and LAB mode. Also understand what pixels are and what resolution is. After knowing this, you can learn about ps, which can be found online. It is very important to understand ps and the characteristics and functions of some things in it. There are several aspects that must be understood. For example: layers, channels, masks. Some people think that these are the three most difficult places of rs, but I think they are the three most useful places, which are easy to understand. Knowing this, you can learn some skills and accumulate experience. As long as you keep studying like this for a few months, you will become a master of PHOTOSHOP. Hehe, I hope my words can help you more or less.