Can I bold, italicize, underline, or hyperlink the text on my site?

Yes, you can!

To bold something, surround the words in asterisks: *this is bold*
To italicize something, surround the words with an underscore: _this is italics_
To underline something, surround the words with a plus sign: +this is underlined+

To hyperlink words, put the words in double quotes, followed immediately by a colon and the URL: "Click here to read more":https://www.rileygrey.com - which will look like this Click here to read more