Yii2 modification?

Question

Yii

Hello! I am writing a site on Yii2, along the way the question arose - how can I modify its work? I understand that the modification can be different, therefore:

1. For example, I want to implement new functionality, because I plan to start writing CMS based on Yii2
2. Somehow modify the work of the framework itself, for example, so that the settings are stored in YAML, or modify / change the work caching, whatever
3. Change the existing folder structure, for example, shove all the system code into the "core" folder, and leave only user files in the root, like templates, classes (for the same CMS)?

I thought about the option "There is a class/library/helper for each target". But will it be possible to change the operation of the kernel? Or are there some hooks in the kernel for this? Thanks in advance! Sorry if the question is wrong somewhere.

Answer 1

Why do you want to modify something? Write your modules ABOVE frameworks and implement any functionality.