Magento system uses Composer packages to distribute, install, and upgrade components in an application. Metapackage, Module, Theme and Language are the package types used in the Magento system.
Magento has an in-built profiler that can be used to identify performance problems on the server side.
The configuration XML is the heart of the Magento. This insight really helps to understand the XML files usage in Magento 2.
Understanding the Magento’s directory structure and different types of files directory location.