More complex components will have child elements. Each child element that needs styled should include a named class.
<!-- π DO THIS -->
<figure class="photo">
<img class="photo__img" src="https://picsum.photos/400/300">
<figcaption class="photo__caption">BEM - Block, Element, Modifier</figcaption>
</figure>
<!-- π DON'T DO THIS -->
<figure class="photo">
<img src="https://picsum.photos/400/300">
<figcaption>BEM - Block, Element, Modifier</figcaption>
</figure>