In the past, when the internet was underdeveloped, people relied on school books, as well as various books, magazines and library books to acquire knowledge. In those days, when people wanted to learn any skills, their first reaction was to go to the library to find books or enroll in some skills classes. But for many people, skill classes are a big expense, so most people will not learn them easily unless they need to make a living. Later, with the development of the Internet, people can search the information they need online, including all kinds of electronic books, skills and knowledge. So when it comes to what new knowledge to learn, people's reaction is no longer to go to the library to read books, but to search online more instinctively.

In the era when the Internet is just emerging, there is no concept of online shopping and knowledge payment, and all available information is free. Later, in order to attract traffic, some websites will also provide some free learning materials for learners' reference. Slowly, getting free study materials online has penetrated into everyone's psychology. People are no longer inclined to buy books. If they need any study materials, they will search and download them online, and e-books are gradually emerging.

Now is the era of knowledge payment. Searching for a skill or course on the learning platform is generally charged. You will be allowed to listen to 1-2 lessons for free first, and then you need to pay to study. Some learning materials can no longer be downloaded for free, so you can only use full-time members or recharge them. Of course, most people are willing to pay for their studies. So is it because free learning resources are useless?

Not really, free study materials are still useful, but in the face of online free materials, it takes a lot of time and energy to find them, and how to study systematically after downloading is also a lot of people's distress. One advantage of paid learning is that professionals in a certain field can systematically sort out knowledge points and tell you what is right and wrong, which can greatly save learning time and avoid misunderstandings in learning. These free learning materials are incomparable, so the free materials are not useless, but are gradually screened out by the times.