I found 6000 poor urls on search console. i dont know how to fix the poor urls. anybody help me please, give me a step by step guide where i can learn how to fix google core web vital poor URLs? Well, very often, many pages have the same error, meaning that if you solve a certain issue, you may fix all the pages.
So, group your URLs by templates (product pages, blog post pages, category pages, etc.). After that, pick one URL from each group and test it using https://developers.google.com/speed/pagespeed/insights/ and see the results. It could also be a site-wide issue, meaning that if you fix that problem, all your site will benefit.
Well you can read about Core Web Vitals here
Some external resources-
For diagnosing CVW for pages, check tis blog post — https://web.dev/vitals-tools/