Great question — answering as the UphillTech team:
I am currently working on improving my sites SEO score Before going into detail, please note that the SEO Score in Lighthouse has very little to do with how Google is ranking websites. You can be very successful in SEO with a bad SEO score in Lighthouse. And you can have a good SEO score in Lighthouse without seeing any SEO traffic. It is really just a very basic check that is far from complete. based on my research and feedback the best and easiest way is to expand our sitemap.xml page (We currently have a smaller site) I am not sure what you mean here. Your sitemap should contain all your URLs. What do you mean by expanding it? What links did you add? Was your sitemapnot containing all of...
Full answer by Malte Landwehr: https://webmasters.stackexchange.com/a/139681 (CC BY-SA 4.0).
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