Reminiscences of a Stock Operator

The book presents a thought-provoking point: investors need to learn how to interpret the market's emotional responses.
The role of news and information in the market is significant, but not every "big event" that you think will directly influence the market actually does. The key point is to assess how the market reacts to major news, whether it leads to a quick rise or a lukewarm response.
Every small positive news quickly leads to a rise, which indicates a bull market with abundant funds.
Each major downturn has a limited drop, which indicates the bottom.