I want to know about on-page factors?

[Richard]

A lot of marketers perceive on page factors to make up just 10% of the overall ranking factors. Still you will need to ensure them since they serve as the foundations. On page SEO is all about the things you can do onsite, through the backend to align your website with the proven standards developed through years of case study. Basically, you will need to make sure that search engines don't misunderstand what your website is all about. Some on page factors include:
Page Title
Meta Tags and Description
Page Loading
Canonicalization
URL's
Keyword placement, density, and variations
Image and video metas
Duplicate content prevention using robot commands no index
site structure.. using nofollow and noindex
formality pages such as disclaimer, terms, and privacy policy
and some other guidelines to increase conversion such as call to actions

Most of them you only need to set once.
Then all you need to care about is providing value and high quality content..