Magento FAQ or answers to all your questions

Inspired by the idea ( JavaScript FAQ: ask questions , JavaScript FAQ: Part 2 )

I want to create a similar guide to the eCommerce platform Magento, as I myself am part of its Core team.
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I will try to answer questions regarding various areas of the system: configuration, use of models, details of the system architecture, creation / modification of modules, other nuances of Magento.


Waiting for your questions in the comments or via email: sergiy (DOT) stotskiy (DOG) magento.com.

UPD:
I decided to write this post from nothing to do based on good wishes. So this is not an official company statement.