You can nest not only inline tags. You can easily create a <div> tag to merge two paragraphs. For instance:

<div>
  <p> First nested paragraph. </p>
  <p> This is the second nested paragraph. </p>
</div>

Multiple block elements can be placed inside some other block element - it all depends on the structure you have in mind.

But remember - not all tags can be nested within others. For example, the heading tag <h1> cannot be nested within the paragraph tag <p>.

Can you make italicized text bold? Of course, this is just another nesting of tags:

<div>
  <p> First nested paragraph. </p>
  <p> And this is the second nested paragraph. <b> <i> This text will be both bold and italicized </i> </b>
  </p>
</div>

What do you think, is it possible to swap the <b> and <i> tags and make <i> the parent tag?