what does Columbia mean when they say do not use HARD RETURNS?

[Columbia2002]

<p>It means don’t be like this idiot:</p>

<p><a href=“http://talk.collegeconfidential.com/1061494970-post9.html[/url]”>http://talk.collegeconfidential.com/1061494970-post9.html&lt;/a&gt;&lt;/p&gt;