Topics:

1. Headings (h1–h6)
2. Paragraphs
3. Line breaks and horizontal rules
4. Text formatting tags (strong, em, mark, small, sub, sup)
5. Quotations and citations
6. Code and preformatted text
7. Semantic elements
8. <header>
9. <nav>
10. <section>
11. <article>
12. <aside>
13. <footer>
14. <main>