There are three elements of grid profit, volatility is fuel, grid spacing is netting, and principal size is ammunition. The trend market widens the grid, the shock market encrypts the grid, pay attention to the margin of safety before returns, consider the friction cost, core principles, specific steps, risk control, optimization skills, installment investment, profit reinvestment, risk budget, maximum drawdown, survivability, repeated testing and adjustment, and risk control is the premise of maximizing returns.