Penetrate the rules and channel boundaries of precious metal derivatives trading, and use standardized services and a multi-tool matrix to reconstruct the long-term profit and loss defense line of junior and intermediate investors! This article provides in-depth compliance science on the core underlying logic of gold (XAUUSD) and silver (XAGUSD) contracts for difference (CFD): dismantling the composition of 24-hour two-way trading, margin leverage, and holding costs; analyzing the differences in charging models between standard accounts and ECN accounts; and detailing the practical path to building a rational risk control system relying on MT4/MT5 full-terminal collaboration, intelligent order-following systems, and investor education resources.