Check out example codes for "html aside". It will help you in understanding the concepts better.
Code Example 1
<p>Salamanders are a group of amphibians with a lizard-like appearance, including short legs and a tail in both larval and adult forms.</p> <aside> <p>The Rough-skinned Newt defends itself with a deadly neurotoxin.</p> </aside>
Code Example 2
<aside> <h2>Aside Header</h2> <p>Paragraph</p> <p>Paragraph <a href="url">Inline Link</a></p> </aside>
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