Here is an example of the kind of pretty minimal but valid HTML5 that I usually write when I write html by hand:

    <!doctype html>
    <html lang=en>
    <meta charset=utf-8>
    <title>Hello</title>
    <style>
      /* css here */
    </style>
    <header>
    <h1>Cool beanz</h1>
    </header>
    <nav>
    <ul>
    <li>Home
    <li><a href=/foo.htm>Foo</a>
    <li><a href=bar.htm>Bar</a>
    </ul>
    </nav>

    <article>
    <h2>The Life and Dreams of Irish Setters</h2>
    <p>Widely appreciated for their qualities, the Irish Setter is a breed of dog to behold.
    <p>Lorem ipsum and so on and so forth.
    </article>

    <footer>
    <p>Copyright © 2024, Bob Schmob
    </footer>

Check it :)

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https://validator.w3.org/nu/#textarea