I want to know about the backend code development. Is there any good tutorial or videos available to learn? Suggest me about the development.
To develop any module or customize the code you need to understand the structure of magento.
- It explains about the step by step guide for module development and structure of magento
- It explains about custom module development
- This is one of the best one for the beginers
https://www.mageplaza.com/kb/magento-2-demo.html .Here is an overview of magento 2 backend.At the same time you can go through Nexcess,aster web..etc training in youtube.
I will recommend this 12 hours course on Udemy. It teaches the core concept with real live project. https://www.udemy.com/simplified-magento-2-video-course-from-beginner-to-expert/ Disclaimer: I was part of the creator of the course.
After that, you can go for Magento study group. I found it quite useful https://u.magento.com/magento-2-certified-professional-developer