Why do we not put <h2> and <h3> as child elements/grandchildren of h1 and subsequently body and html?
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Headings are not generally treated as sectioning elements that contain child elements. They are intended as headings, not parents.
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Got it, thanks! I saw in the further lessons <div> is closer to what I expected.
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Similarily we have,
article
section
li
blockquote
header
nav
footer
&c.
HTML 5.2: 3 Semantics, structure and APIs of HTML documents = Kinds of content
The above link is scrolled down quite a bit from the root of the page. Definitely bookmark it and add it to your reading list for down the road. Just this one page is like an intensive course in all the inner workings of HTML. Dry and technical, best nibbled on rather than gorged.
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Thank you so much mtf. I really appreciate the way you answered this question and all your other responses to various questions. For someone who is a newbie your answers are very clear and puts a lot of flesh or detail that have been helping me understand and follow up since I began with the Code Foundation courses. Yes, sometimes I get confused but your answers always comes to the rescue when I read them. Please keep up the good work sir. When I grow up I’d like to be like you… 
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