Hi..... want add more like.... 1. site have xml sitemap 2. How does the navigation work 3. What is the page file extension 4. at lest 250 word of text on homepage etc.....
The page file extension has no bearing on SEO. I typically tend to look at canonical URL issues, quality and relevance of the content, black-hat SEO schenanigans (if they're there, I tell my clients to remove them right away), internal linking structure and information architecture, usability and accessibility (the former to improve conversions, the latter to reduce the bounce rate on a Web site), as well as a few trade secrets I'm not going to divulge.