How to create a BEM block structure correctly?

Question

BEM

Let's say there is a section block, it has several articles.

<section class="blog">
  <article>
    <h1> Заголовок </h1>
    <p> Какое-то описание </p>
  </article>
<article>
    <h1> Заголовок </h1>
    <p> Какое-то описание </p>
  </article>
<article>
    <h1> Заголовок </h1>
    <p> Какое-то описание </p>
  </article>
</section>

What is the best way to proceed in this case? Article will be a blog block element? But, given that there can be a lot of these articles, it is better to put it in a separate block. Those. it turns out I need to create 2 files with a description of the properties of these blocks. What if section has no rules? Remove section and leave only articles?