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xiaohulu_gold
shared author's Samuel Olowoyo article
Guide to Testing and Optimizing of Expert Advisors in MQL5 
This article explains the step by step process of identifying and resolving code errors as well as the steps in testing and optimizing of the Expert Advisor input parameters. You will learn how to use Strategy Tester of MetaTrader 5 client terminal to find the best symbol and set of input parameters for your Expert Advisor.
xiaohulu_gold
shared author's MetaQuotes article
Expert Advisor Sample 
The principles of MQL4-programs development are shown on sample of creating a simple Expert Advisor system based on the standard MACD indicator.