Need help with correcting warnings found with validator.w3.org

[damiun]

Hi,

I am trying to correct the warnings validator.w3.org found on my site.
But i dont understand a lot of them.
I hope people here can help me out.

Error Line 145, Column 92: document type does not allow element "link" here

�ss" type="text/css" rel="stylesheet"></link>

--------------

Error Line 195, Column 4: document type does not allow element "h1" here; missing one of "object", "applet", "map", "iframe", "button", "ins", "del" start-tag

<h1><center>bobslee</center></h1>

Thanks in advance,
Dominick

[Eric Barnes]

Any elements that do not have matching closing items need an ending slash. IE:
<br />
<img />
<link href="css/style.css" rel="stylesheet" type="text/css" />

H1 elements need to be the tag then the text:
<h1>Title</h1>

If you want to center it use css.