My "Bottom-Fishing" Principle is as follows:
Buy in separately: Don't buy everything at once; buy in several times to reduce the risk of the market potentially continuing to decline.
Observe the overall environment: It's best to wait until market sentiment stabilizes or the main stock indices start to rebound before considering entering the market.
Set stop-loss points: If losses reach a certain level, promptly cut losses to avoid losing more.
Look at the fundamentals: Choose good companies that have been excessively sold off due to market sentiment but still have decent fundamentals.