Step by step tutorial for writing mt4 EA

 
Step-By-Step Guide to writing an Expert Advisor in MQL5 for Beginners has "MetaTrader 5  Trading systems" in the title of the article so I reckon it is the instructions for writing an EA using Metatrader 5. What is the equivalent guide for how to write an EA using Metatrader 4?
 

Then following your own URL logic, you will have:

 
Of course, I had seen them. But it is not clear where to start, as those are adhoc deep dive articles.