There are far fewer certain opportunities in the market than you think. As a retail investor, you can't find them by looking at fundamentals or K technical analysis one day. Only a few advantages established by using tools, such as the black and white equation, are truly certain. Or some arbitrage opportunities.

Don't mistakenly think that your prediction of the market is certain. If you are bullish, go long, and if you are bearish, go short. Think about the strategy, at least consider the most basic acceptable loss, stop profit, position size, and use spot or contract or option or loan tools.

As Livermore said: "The first step is to estimate the future market and potential of a certain stock; the second step is to determine at what price to enter the market. At other times, you should stay out of it and let the market gradually develop trends."