Content of Page: The content of a page is what makes it worthy of a search result position. It is what the user came to see and is thus extremely important to the search engines.
Good content is linkable: From an SEO perspective, there is no difference between the best and worst content on the Internet if it is not linkable. If people can’t link to it, search engines will be very unlikely to rank it, and as a result the content won’t drive traffic to the given website.
Title Tag: Title tags are the second most important on-page factor for SEO, after content.
URL: Along with smart internal linking, SEOs should make sure that the category hierarchy of the given website is reflected in URLs.