I think I find a few points that are quite good to utilize:

index.php

<meta name="keywords" content="Branding, Web Design, Packaging, Illustration" />
<meta name="description" content="This is One, a multipurpose website" />
<meta name="author" content="Davy Gunarso">          

Another thing that I would like to ask is what is the purpose of using meta name?

If you mean the name attribute of a meta tag: that's to indicate what the meta tag is indicating ;).

Anyway, any other way to optimise website seo?

Besides using meta tag?

Yes of course :). Google around a bit and if you have questions, come back here and ask about it.