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.
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