https://docs.astro.build/en/tutorial/4-layouts/
Build a blog tutorial: Unit 4 - Layouts | Docs
Tutorial: Build your first Astro blog — Use Astro layouts to share common elements and styles across your pages and posts
tutorial unitbuildbloglayouts
https://docs.astro.build/en/tutorial/3-components/
Build a blog tutorial: Unit 3 - Components | Docs
Tutorial: Build your first Astro blog — Build Astro components to reuse code for common elements across your website
tutorial unitcomponents docs