Docusaurus has some nice custom callouts called “Admonitions”.

<aside> ℹ️ Note about something

</aside>

<aside> 💡 Tip about something with an internal link.

</aside>

<aside> ❗ Info about something

</aside>

<aside> ⚠️ A Caution about something

</aside>

<aside> 🔥 Something dangerous ← should be bold

</aside>

<aside> 🚧 A note about this being under construction

</aside>