You can control the timing of buying or selling a coin using the following methods:

If you really can't understand volume and price, don't know what constitutes a surge or a decline? Are you unclear whether the price increase is large or small? Also, can't define whether the coin's position is high or low? Then:
1. During rapid upward movement, sell (strong breakout period, funds uniformly intervene to push up the price, thus inducing more buyers)
2. During rapid downward movement, observe or buy (funds exit consistently, the market maker dumps to clear floating positions, then picks up cheap chips to push the price up)
3. During slow upward movement, buy (market maker lifts and suppresses the price simultaneously, causing a slow upward trend, which is also a way to clear floating positions; once cleared to a certain extent, initiate a strong rally)
4. During slow downward movement, sell (a true process of unloading, like dull knives grinding people down)
Note:
1. The above analysis of a coin's trend is based on the assumption of a stable overall market and is not applicable to extreme surges or crashes.
2. The same applies to strong positive or negative news about the coin.