Left-side trading: buying or selling in advance when the market situation is unclear, betting that it will soon reverse. For example, bottom-fishing during a downtrend, thinking 'it's almost at the bottom.' This method is high-risk, but if the direction is guessed correctly, the returns can be considerable.
Right-side trading: acting only after the market trend is clear, such as entering the market when the price breaks key levels or begins to rebound. This method is more cautious, with lower risks, but may miss out on the earliest wave of profits.
In summary: left-side is 'betting', right-side is 'following'. Which strategy to choose depends on your risk preference.