What are the paid knowledge answering platforms?

With the growing awareness of "paying for knowledge", many paid knowledge platforms have emerged in the field of paid knowledge. Among them, for paid question and answer, the better platforms are divided answer, Weibo paid question and answer, etc. But we can't generalize. After all, almost all knowledge payment platforms now have the function of paying questions and answers, and the research is quite in-depth.

In fact, to put it bluntly, paid knowledge quiz is a teacher who is very good at a certain field/topic/topic, and uses his own specialty to pay questions and answers to achieve the purpose of realizing knowledge.

For example, there is also a paid question-and-answer column in the knowledge store: the administrator can add main information in the question-and-answer area of the store, describe the teacher's good areas clearly and set the charging price for questions, so that students can pay for questions if they are interested. After the mobile students pay the questions to the answer master, the answer master answers the questions for the students in the form of pictures, words or voices.