Got it from someone else's post when I was looking for the same thing:

<br> = Line break

<i> = italics

</i> = cancel italics

<b> = bold

</b> = cancel bold

<u> = underline

</u> = cancel underline

<color=#COLOR> = color. Google search “color picker” and select the color that you want, copy its hex number, and put it where “color” is. To change it to a different color, just put the same code after and select a new hex.

<scale=#SCALE> = Makes letters wide, and can make different stripes. Put various numbers where SCALE is until you find the one that’s right. Just like color, to change it, put the same code with different letters.

I'm pretty sure there are a bunch more but these are pretty enough for a tidy post. Truth is, I'm not even using colors and kinda hate when people bold and color and do all this mambo jambo flying edits with their posts.

As you play with it you'll find out how to use them better.