If you are more interested in on-page SEO, we should probably warn you that, although it’s still very important to optimize on-page factors, it’s extremely unlikely to work on its own unless your market is particularly niche.
On-Page SEO Checklist:
Always start with keyword selection, research and testing
Meta Description tag
ALT tags
H1 ta
URL structure
Internal linking strategy
Content
Keyword density
Site maps, both XML and user facing