The simple point is to learn a technology or major and find a related job to make money. Such as photography, accounting, lawyers, doctors, etc.
A little more complicated is to produce knowledge products and sell patents to make money. Such as writers and researchers.
Especially in the era of knowledge payment, knowledge is easier to realize, and you can use your own knowledge to solve other people's problems in your own field, thus gaining benefits. For example, Zhihu Q&A, Baidu Q&A and experience consultation.
As long as you are willing to use your head and work hard, you can make money anyway.