With you choose elements by meaning, not by appearance. A link is an <a href>, a button a <button>, a list a real list. Appearance is controlled by , not by the .
Core semantic HTML5 elements are:
<header>and<footer>for header and closing areas,<nav>for navigation,<main>for the unique main content,<article>for standalone content,<section>and<aside>for sections and supplementary content.
A pure "div soup" hampers orientation, accessibility and machine understanding. Semantic HTML is not a guaranteed ranking factor, but it is clean markup that makes main content, navigation and extras clearly distinguishable, for people and machines alike.