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You can read more about on-page SEO in this Moz article - https://moz.com/learn/seo/on-page-factors

Or you can check out this free lessons in SEO-> Search Engine Optimization (SEO) Training Videos | Affilorama

Since you're a beginner, I'd recommend starting with the very basics and building up your understanding on a good foundation. Check this site SEO Book - Advocate for Monopoly Capitalism, Rooting for Google it will help you to understand what is on-page seo.

Well, on page SEO is quite tricky - it is a delicate balance between spam and excellent on-page optimization.

Since the Moz article was already dished out, here's a tasty snippet and a tip all webmasters should keep in mind:

Source

Just remember though, be sure to link RELATED phrases to RELATED pages. For example, words like "contact us" can be linked to the "Contact Us" page.

Other than that, on page SEO involves making your website as mobile-friendly as possible, considering that Google puts a premium on websites who run well on mobile devices.

As you know SEO is important for every type of business it leads to business growth and visibility of website/ business on search engine. The On-page of the website help you to index your website easily with respect to search engines. As in On-page i will recommend you to read SEO Blogs which will make you update regarding SEO updates
Here are list of Blog i will recommend you to visit

SELand
SEOmoz Blog
SEOBook
SEJournal
Tech Crunch
Mashable
Moz
SearchEngineWatch
SearchEngineJournal

The main factor you should keep in while talking about SEO are :-
Top quality fresh content (This is always the most important SEO factor!)
Optimize Your Website around One Keyword or Topic
Optimized titles and descriptions
Proper URL Structures
Image optimization (image size, proper image names, use of ALT tag)
User friendly 404 pages
Fast loading pages
Use of Hummingbird-Friendly Keywords
Utilize Proper Heading Tags and Optimize Page Titles

On page SEO includes many factors that affect SEO, like meta title,description and keyword tags, and most important the content of a page.

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Thank you all for your help,i really appreciate it.I got very good stuff about SEO onpage from you guys,that really helps me out.