I'm sorry, but I speak a little English.
If my post is not good category, please change.
I read this: docs.opencart.com
The opencart.hostjars.com is not works.The easiest way to create a module is to download the DIY Module Builder skeleton from HostJars.
I read this: github.com/opencart
The Extension Building Tutorial Part 1 is great, but why not Part 2, Part 3 etc?
Please help me, I would like learning developing, but the tutorials and docs are very not helpful and the onlone tutorials are 1.x or 2.x versions, not 3.x. Please send me a link a helpful tutorials. I would like developing modules payments and shipping. Thanks.