Take a look at the course blog for the topic "TextEdit Travails." Looks like you need to set the preferences to "plain text." Go ahead and do this, and re-upload (and re-tag, so I look at it again), and you should be good.
Clearly this page doesn't pertain to learning HTML per se, but it helps put in to perspective the whole notion of learning a new skill/language/subject. Knowing HTML may quite possibly be the one attribute that helps one candidate land a coveted job over another. Or, it may never come up in our careers -- but our minds will have been made "more interesting" nonetheless.
This is fine for the assignment, but note that it will not validate (I assume). Take a look at that second <ul>. You've got an un-nested <p> tag there--it starts before the <ul> and ends before the </ul>. Actually, that <p> is extraneous, so you can just delete it...