А есть где-нибудь руководство, как запустить магазин с нуля? Добавить какую-нибудь тему, добавить товары и все такое? Для тех, кто с Magento никогда дел не имел?
You can follow the below Magento documentation for start.
Or do you want any specific area, then let me know.
I hope it will help you!
I'm looking for a some complete practical example of some sample shop startup from the scratch
You can also go through the below Magneto PDF file for better understanding.
Few more links :
I would suggest you to go through with the video tutorial provided by Magento itself, hereby I am sharing the link for the same - https://devdocs.magento.com/videos/
From the above link you will see a few videos uploaded and shared by Magento itself which gives you an idea of how to set up store and products, categories, etc.
Also, there are few training courses available for the business users which is completely free you can look to register and learn from there as well, it is for the non-technical and technical user who is just taking a very basic step towards Magento, here is the link - https://u.magento.com/free-intro-to-magento-2-for-business-users
Apart from that you can look to evaluate the links and user guide which is shared by @Vimal Kumar That will give you a complete understanding of functional flow from the backend of the Magento.
Hope it helps !