The first thing, knowing what you know, is actually the things within the scope of your knowledge, such as the recent surge in the risk of **, such as the profit of non-operating income can not be long-lasting, I ensure through the system that everything I know can be effectively applied in every ** transaction.
The second thing, knowing what I don't know, is knowing that I know the blind spot in the **, for example, Buffett basically doesn't touch the emerging network technology stocks very much, from my point of view, I will use the fundamentals to do a round of screening first, leaving less than 10%**as my big**pool, similar to theme stocks, chasing up and down, listening to the news**, these things, are things that I know I don't know, and the system norms and guidelines will ensure that I don't touch them. 
The third thing, I don't know what I know, here is about intuition, such as **inside** before, with my years of experience, I will feel that taste of blood. This, doing the system and quantifying, is very disadvantageous, but every time a non-system judgment crashes, I will go to review, if this is something I don't know I know, I will definitely turn it into something I know I know, and then integrate it into the system, just like Athena's Saint Seiya, the same trick in front of the Saint Seiya, the second time it will be invalid.
The fourth thing, I don't know what I don't know, in the final analysis, is that insects can't understand human behavior, here as an insect, the only thing I can do is to broaden my cognitive boundaries, such as reading, working and traveling, and the thinking behind these things, hoping to slowly transform these things that I don't know I don't know into things I don't know, live to be old, and learn from it.
*It is not easy to make money, everyone encourages us.