This article contains some useful information:
https://iandevlin.com/blog/2011/04/html5/html5-section-or-article/
There's no reason you can't have a section, in an article, which is itself inside a section, so long as that best describes the content on which you're working.
Both are correct. It depends on the incident you are going to apply it.
Read below links to understand it's usage,
Article - https://www.w3schools.com/tags/tag_article.asp
Section - https://www.w3schools.com/tags/tag_section.asp
Cheers !!!
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