<3 Thank you! :) I'll be passing this article around every time someone asks me anything about Steemit HTML.

Some other thingies

<a href="https://example.com"> link text </a>
<img src="https://image.com/something.jpg"> <-- an image
There's <h5> and <h6>
<hr> <--- Horizontal ruler to divide text vertically.

And using three backticks ( ``` ) for embedding html.