How big can an operation and maintenance engineer do?

If you only do first-line operation and maintenance, you will feel powerless when you are 40 years old. However, personal advice: it is very important to choose your future direction before you are 40 years old, and then you will become an operation and maintenance manager, operation and maintenance supervisor, operation and maintenance director, etc. Or switch to be an IT lecturer, start a training class and so on.

Operation and maintenance engineer is a very popular position at present, with a high employment rate. The prospect of operation and maintenance engineers can be divided into junior operation and maintenance-senior operation and maintenance-junior system architect-developmental senior system architect. There are many aspects of learning knowledge. If you want to know more about the development and learning direction of this direction, please believe me personally.

How big can an operation and maintenance engineer be, what are his prospects and what do he need to learn? What books does God recommend? -Zhihu? Web page link