To catch the bottom, what you need to know is:

1. Grasping the Major Trends:
1. Take Bitcoin and Ethereum as benchmarks, entering at the bottom range and exiting at the top range.
3. Keywords: Range. As long as the general direction is correct, there's no need to get caught up in the extremes of low and high points. The rising tide of Bitcoin and Ethereum will sweep through and push the vast majority of altcoins upward.
2. Positioning of minor trends:
1. Precise entry point for the rise of the cryptocurrency.
2. Keywords: Points. Often able to find breakout high points at the bottom of volume surges, gradually increasing volume accumulation points, low points after a volume drop, golden ratio retracement points during correction periods, strong support double bottom points when descending, and daily pullbacks to low-volume doji states, etc., can identify breakout or reversal points.