<article> and <section> are the two most misused semantic elements. They're both block containers, both accept headings, and both can nest inside each other — yet they have distinct, specific meanings. This lesson pins down exactly when to use each, how to nest them correctly, and introduces <figure> and <figcaption> for self-contained media content.
1-A 2-A 3-A 4-A | 5 article 6 section 7 = <article> per post 8 = <section> each, with headings 9 = article = independent; section = thematic part of something | 10 = article > section(intro) + section(comments with article children)