I have been stuck on it for some time
Have you read the lesson text that describes what a self-closing tag is?
Briefly, it is any tag that does not have an ENDTAG, only and OPENTAG, and can thus not contain anything.
<p>This is a container element with opentag and endtag.</p>
^ ^
OPENTAG ENDTAG
Example list of self-closing tags
<hr> or <hr/> or <hr />
<br>
<link>
<meta>
<input>
<img>
There are others but i think you get the idea. Re-read the lesson and be sure you understand and follow the instructions.
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