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.
 

search google. There is many videos on utube also.

You can also look on codebase. There is hundreds of codes there for you to copy/peruse.

The documents are online also, But you can also read the help files in MetaEditor. Use your noggin.