You can memorize the list, but it's easier than that: things that can go in a paragraph (which includes images) let the <p> continue, while things that can't (w

You can memorize the list, but it's easier than that: things that can go in a paragraph (which includes images) let the <p> continue, while things that can't (which is the long list there) close the <p>. In practice you get used to it very quickly.