The EA LifecycleAn Expert Advisor in MT5 has a structured lifecycle: OnInit sets up parameters, OnTick executes on every price change, and O

The EA LifecycleAn Expert Advisor in MT5 has a structured lifecycle: OnInit sets up parameters, OnTick executes on every price change, and OnDeinit cleans up. Understanding this flow is essential before writing trading logic.MA crossover EAWe build a complete EA: input parameters (fast/slow MA periods, lot size, stop-loss), crossover detection in OnTick, trade entry with position management (checking existing positions before entering), and trailing stop logic. All in clean commented MQL5.Common pitfallsPosition double-counting, hardcoded magic numbers conflicting with other EAs, using OrderSend without checking return codes. We show each pitfall and the fix.Practical exerciseWrite the MA Crossover EA and compile...