Correct use of HTML Semantic Tag "Article"

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Hi! I’m working through how to correctly use semantic tags to make my sites accessible. I understand that blog posts or blog excerpts should be tagged as “article.” Two questions:

  1. Does this apply even in an instance where all I have as my blog excerpts are a picture, a title, and a blog summary? (You’d have to click in to the post to see the actually content.)

  2. How does this work for dynamic content? I see that I cannot give an individual collection item an “article” tag… see screenshot. So I’m assuming that I would give the entire Collection List the id? Like this.
    Is that the right way to tag it?

This is from my test site blog page, here.