As you put as many texts as you can on your page, you will need new elements of formatting your page as you want and need. In attribute's tutorial we have talked about ways of adding style to your wanted elements. These formatting tags can make elements bold italic underlined cut and not only
html<p>Example of <b>Bold Text</b></p>
<p>Example of <em>Emphasized Text</em></p>
<p>Example of <strong>Strong Text</strong></p>
<p>Example of <i>Italic Text</i></p>
<p>Example of <sup>super-scripted Text</sup></p>
<p>Example of <sub>sub scripted Text</sub></p>
<p>Example of <del>struck-through Text</del></p>
<p>Example of <code>Computer Code Text</code></p>Example of Bold Text
Example of Emphasized Text
Example of Strong Text
Example of Italic Text
Example of super-scripted Text
Example of sub scripted Text
Example of struck-through Text
Example of Computer Code Text
These tags should be used with moderation. What I am trying to say is that is indicated to use them for bolding or tilt a word or paragraph. When you want to use them for example in a whole paragraph, the best is to use CSS. Anyway, this is just advice, after all the decision is yours and you can use them in correlation with how your experience indicates you.