The quick link to KDP is:
The ones I commonly use are:
<br> to create line break. I usually use 2 of them <br><br> to create a line break AND a blank line.
<strong></strong> for bolding text.
<i></i> for italic text.
<hr> creates a horizontal line across the page. I don’t currently use this but may in the future.
<ul> Creates a bulleted list from enclosed items, each of which is identified by a <li> tag. So that would be
How to use these is explained reasonably well here: