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As the title itself says: Should I compose only the repeating items? an example:
<navbar>
  <a href="LINK">
    <img src="imagem.jpg" alt="Minha Figura" />
  </a>
  <ul>
    <li>Menu1</li>
    <li>Menu2</li>
    <li>Menu3</li>
    <li>Menu4</li>
    <li>Menu5</li>
  </ul>
</navbar>
In the above example, when considering that it is a single page and the menus are anchors I compose the navbar, a, ul and li. is correct?
A component is not an HTML element. Search Google and Youtube for different people talking about componentization so you know and decide what you need. Becomes opinion-based, since you will hardly find two people componentizing a page in the same way
– Rafael Tavares