[Repost] How to quickly understand an industry

I think this is a universal problem. Therefore, I will introduce my ideas here. Hope to give you some inspiration!
From a layman to quickly become an expert in an industry, I think there are four ways to try:
First, find the enterprises in this industry, go in for a few months, and learn with the purpose of learning and entrepreneurship, this is a very effective method.
Type 2: Find a knowledgeable person to chat. Give yourself a goal. You must chat with people in the industry every day. Ask questions you don't understand. It's easy to find such a person. You can go directly to the store and look for the store owner. The boss ignores you. You can look for a shop assistant. Of course, you need to benefit others. But this benefit is very simple. It's nothing more than a meal or a drink, or even a cigarette. You can chat with others for a long time! If you can fix a person every day, chat for two hours, chat for a month, and I want to know what else you are a quasi-expert!
Third: go to the bookstore. I found that the bookstore is a good place and a free library. And everything in it is up-to-date. It may take you a few days to create a bookstore. Do not rely too much on Network Information. Many of the free online materials are incomplete. In a bookstore in a medium-sized city or above, the information in the bookstore is amazing. You want to open a store. Now there are a lot of books in the "open a profitable store" series in the bookstore. Although the content is not very good to me, I can give you at least some perceptual knowledge and knowledge points, you can find more answers! Here, we will add that the improvement of the knowledge system is a link-based improvement. When you read a book, you find that you do not understand the concept mentioned in the book. Then you can go to a book dedicated to this concept to learn, just like the "HYPERLINK" on the network, you can gradually enrich your knowledge system through links!
Type 4: participate in various exhibitions or meetings. I usually pay more attention to some local news and newspapers to see if there are any opportunities for exhibitions or meetings. If you are fine, I can go to some hotels over the weekend, instead of taking souvenirs, instead, they learn and make friends. I printed a box of business cards for myself, which is not expensive at all. Think about what I wrote above. You can compile a company or position. You can make this job a little bigger, not to lie, but to make it easy for you to get in touch with others for the first time! Because people like to make friends with successful people. You can't write anything as long as you don't want to cheat. I have such an experience that if I have never dealt with anything before and suddenly find someone else to know something, most people will be wary of you. If you met each other at a meeting, handed out a business card, talked a few times, and then called to contact each other, it would be much more convenient. After all, from a psychological perspective, you are equal.

[Repost] How to quickly understand an industry