Understand styles.

<ul style="list-style-type: square">
...
</ul>

<style type="text/css">
ul {
   list-style-type: square;
}
</style>

Construct style rules.

Create styles for nested tags.

https://css-tricks.com/specifics-on-css-specificity/
http://www.csszengarden.com/

Create classes and IDs for applying styles.

Apply styles to hyperlinks.

Create and link to external style sheets.