Slightly related note, if you are a web developer, I would highly recommend reading this long read on "How to Section Your HTML". This is especially important if you want your site to function correctly when screen readers are used for accessibility purposes. I would pretty much give 100% credit to this article which helped me go from a newbie on HTML design to knowing how to correctly structure it:

https://css-tricks.com/how-to-section-your-html/