On Page Factors
 

HTTP response code errors
Site speed
Internal links pointing to the page
Correct rel=”canonical” Use
Absence of Broken Links
Perfect HTML Code
Valid CSS
Keyword in URL
Keyword in Page Title
Keywords in Internal Anchor Texts
Keyword in H1 Text
Keyword in Image Alt Text
Keyword Frequency (body text)
Keyword in Bold/Italic
Title tag optimization
meta description
header tag optimization
content
keywords density
image name and alt tag
html improvement
clean code

All The Heading tags are included in the on page seo technique also the code optimization and content optimization

On Page Factors-

meta tag
sitemap
H1 tag
Alt tag
Site speed
Internal links etc.

Page Titles. Your page titles are one of the most important SEO factors on your site. ...
Meta Descriptions. Many people forget to include meta descriptions for their pages. ...
Meta Tags. ...
URL Structure. ...
Body Tags (H1, H2, H3, H4, etc.) ...
Keyword Density. ...
Image SEO. ...
Internal Linking.

On Page Factors-

meta tag
sitemap
keywords analysis and using them in description and title
Image and content optimization
robot.txt
internal linking
bounce rate

Thanks for sharing very nice information to all

11 Best On Page SEO Techniques 2017
①. Title
②. Meta Description
③. Post URL
④. Heading Tags
⑤. Keyword Analysis And Their Use
⑥. Keyword Density In Content
⑦. Alt Tags In Images
⑧. Internal Linking
⑨. External Linking
⑩. Use Of Videos In Content
⑪. Bold, Italic & Underline Tags

Onpage factors are as follows:

Meta Tags
Google Analytics
Google Webmasters
Sitemap
Robots.txt
Internal Linking
Content Marketing

URL
title
meta description
page content
page target keyword
use log tail keyword
ui, ux
internal links
page menu, font etc.

Thanks kunal for the information.