Literally speaking, selling high and sucking low refers to the behavior of bookmakers or retail investors with large positions, selling their own stocks at high prices and waiting for the same number of stocks at low prices to reduce the average cost.

Chasing up and killing down refers to catching up with rising stocks and withdrawing from falling stocks, which generally refers to the behavior of retail investors.

However, it is very dangerous to do so blindly. Blindly chasing the stock price at a high level may attract the attention of the bookmakers and suppress the stock price. Don't panic when your status is low. Maybe it's just a shock in the dealer's plate. As long as you set your own stop-loss price, you are not afraid of being cut.