As we all know, the core of philosophical research is world outlook and methodology, that is, how to understand the world and how to transform it with methodology. As a human activity, securities investment naturally applies to the category of philosophy, so securities investors should first understand the general knowledge of philosophy and logic: (1) The foundation of logic is concept, judgment and reasoning, and the definition of connotation and extension of concept is the foundation of logic; (2) The core of Marxist materialist dialectics is contradiction, which is the unity of opposites and the driving force for the development of things.

(1) It is clear to all that these two concepts are not about teaching others how to teach others how to swim. Because investment must be realized through securities, securities investment includes stocks, funds, bonds and financial derivatives (spot, futures, options, etc. ), in this case, our investors should not only focus on one aspect, but should be a portfolio, and rationally allocate it in the portfolio to avoid "putting eggs in one place". (2) Even if you are an investor and only have a soft spot for stocks, it is understandable. Contradictions are unity of opposites. There will be ups and downs. Where there is a bear market, there must be a bull market. Everyone will always remember Buffett, but few people know Chanos. The trend is obviously downward, but everyone finds many reasons to prevaricate themselves. Margin trading and stock index futures are good tools for hedging and arbitrage. Why not have a soft spot for the rise?