A note is just a bit of information that adds to the article by clarifying something.
You will want to view the source by clicking on that link at the very bottom of the page. That way you can see the plain text and how all these things are structured to produce this document.
I can add multiple paragraphs to a note.
The note stops once the indentation is completed.
You also have warning, tip, caution and important that have different color styling.
This is a tip that might interest you with an idea of how to do something that you might not have thought of otherwise.
This is a caution to be careful how you do something or it may not work.
This is a warning meaning that you could do some damage if you do this.
This is an important thing that you need to do that is easily overlooked and will not work otherwise.
This is a seealso directive with a link Admonition