Good reference for understanding refactoring, design patterns, SOLID principles

General Architecture, design, OOP
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Will be helpful. :heart:

https://refactoring.guru/
Refactoring.Guru makes it easy for you to discover everything you need to know about refactoring, design patterns, SOLID principles, and other smart programming topics.

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There are my writings about SOLID in Yii 2 cookbook as well: https://github.com/samdark/yii2-cookbook/blob/master/book/solid.md

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