On-page SEO is anything that you do to your site files themselves in order to rank better in the search engines. This differs from off-page SEO, which is primarily concerned with gaining links to your site from other sites.
No type of SEO is more important than the other. You need both on-page and off-page SEO to rank well, the best on-page SEO isn't going to get you anywhere without good incoming links. And the best incoming links in the world can't help you if your site is crawler poison. However, there is an upper limit you can reach with your on-page optimization where you time will be then better spent on off-page optimizations.
What follows will be an overview of fundamental on-page search engine optimization techniques.
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