W3C validation

Hello,

I’ am a starter in the world of WordPress. In my search for a good template I discovered the mantra-template.
Running a clean template (without any plugins or modification of code) through the W3C-validator I found 5 errors:
1. Bad value X-UA-Compatible for attribute http-equiv on element meta.
<meta http-equiv=”X-UA-Compatible” content=”IE=edge,chrome=1″ />
2. Element meta is missing required attribute name.
<meta property=”template” content=”mantra” />
3. The hgroup element is obsolete. To mark up subheadings, consider either just putting the
subheading into a p element after the h1-h6 element containing the main heading, or else
putting the subheading directly within the h1-h6 element containing the main heading, but
separated from the main heading by punctuation and/or within, for example, a span
class=”subheading” element with differentiated styling. To group headings and subheadings,
alternative titles, or taglines, consider using the header or div elements.
<hgroup>
4. Bad value category for attribute rel on element a: The string category is not a registered
keyword or absolute URL.
…jken in Geen categorie” rel=”category”>Geen categorie </span>
5. Element link is missing required attribute property.
…ontent/themes/mantra/style-mobile.css?ver=3.5.2′ type=’text/css’ media=’all’ />

How can these errors be solved? I have no knowledge of php or html. Maybe this is a update issue???

Who can help???

Gr. Glen