On-page SEO plays a vital role in SEO. After successfully completing the design and development part of the website you can start with On-page SEO. On-page SEO helps search engines understand your website better, to gauge if your content would be relevant to people seeking for information about anything online using a set of keywords.
The various activities that you can do on a daily basis in on-page optimization is as follows:
Keyword Research & Analysis
Competition Analysis
Content Optimization
Internal Linking structure Changes
URL Structure Changes
Site-map updating / creation
Keyword URL Mapping
Creation of Meta Information
Title tag (LSI Based)
Description tag (LSI Based)
Alt tags (LSI Based)
HTML Coding, Validation & Correction
H1, H2 & Strong tags
Canonical Issue Check
Error 404 page optimization
Xml Sitemap
Robots.txt
URL Architecture
Google, Bing & YAHOO Site map Authentication
So in this way you can work on on-page optimization for SEO.