Hi,
Most Important ON Page Factors are:
1. Check Canonical Issue in URL
2. Meta Title
3. Meta Description
4. Meta Keywords
5. Keyword Prominence, Frequency, Proximity
6. Outbound Links
7. Image SEO (Alt Tag)
8. Heading Tag
9. Broken Lining
10. Keyword Density
11. Robots.txt
12. Sitemap...