Design patterns
What is singleton ?
https://devdocs.magento.com/guides/v2.4/extension-dev-guide/factories.html
What is Observer ?
What is dependency injection ?
https://developer.adobe.com/commerce/php/development/components/dependency-injection/
What is Difference beetwen ResourceModel and Model ?
https://www.codilar.com/blog/magento-2-models-resource-models-and-collections/
What is diference beetween cache:flush and cache clean ?
https://www.armmage.com/2021/06/09/magento-2-cache-clean-vs-cache-flush/
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