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Thomas Schmidt
shared author's Samuel Olowoyo article
Excellent beginners article, well authored and despite programming MQL for over six years, there were still a few snippets that even I learned.
Step-By-Step Guide to writing an Expert Advisor in MQL5 for Beginners 
The Expert Advisors programming in MQL5 is simple, and you can learn it easy. In this step by step guide, you will see the basic steps required in writing a simple Expert Advisor based on a developed trading strategy. The structure of an Expert Advisor, the use of built-in technical indicators and trading functions, the details of the Debug mode and use of the Strategy Tester are presented.