When I was in the first year of research, I read the book Principles written by the founder of Bridgewater. When I read this book, I felt that the overall writing was okay, but there were always various checklists, listing a bunch of things, and then every time I went to check them one by one , I was very puzzled at the time, am I not enough brains, are these lists just to make up the word count, but as time goes by, two years later, when I look at it today, I suddenly find that things like checklists are very stupid. But it works well. This article, on the other hand, is a checklist on the content of the transaction.This article is only a record of personal investment thinking, does not constitute any investment advice, the pattern is different, the position is different, for reference on