Consistency and Reusability - Developers can be certain consistency through the complete website, by defining styles in the central CSS file. Styles might be reused across several pages, reducing redundancy and producing updates a lot easier. The CSS Performing Group often publishes "Snapshots", a collection of full modules and portions https://www.presta-addons-modules.com/en/opencart-seo-automatic-google-rich-snippets-json-ld-integration-opengraph-twitter-tags-schemaorg.html