If you want to understand what really moves the needle in SEO, check out the...
https://future-wiki.win/index.php/Biomondo_Study:_What_the_Rise_of_SEO-First_Agencies_Means_for_Service_Models_and_Site_Architecture
If you want to understand what really moves the needle in SEO, check out the case study on WebFX’s work with mid-sized e-commerce brands