So far, all our text looks the same - plain text in paragraphs. HTML has a few tags for basic formatting directly in your markup.
Two tags make text bold: <b> and <strong>. They look the same visually. The difference is semantic - <strong> tells screen readers to emphasize the text, <b> is purely visual. In practice, you can use either one.
<p>Salesforce has <b>three</b> front-end frameworks.</p>
<p>LWC is the <strong>most important</strong> one.</p>These tags go inline - they sit inside the sentence, not on their own lines. You'd never put a <b> tag on a separate line the way you would a <div>.
<br> forces a line break right where you place it. It's self-closing - no </br> needed:
<p>123 Main Street<br>San Francisco, CA 94102<br>United States</p>This is useful for things like addresses or short multi-line content where separate paragraphs would be overkill. But don't overuse it - if you need space between sections, use <div> or <p> instead. Using <br> to create spacing is a common beginner mistake.