I want to use GUIDs as a PK in my database and interested in using it in the URL. can I do this without affecting SEO?
Yes you can, SE are getting smarter and could understand your URL's but maybe you should read more about those subjects: 1- URL Rewriting 2- URL Redirecting 3- URL Canalization And properly use the new html tag related to the 3rd subject Hope i was clear and helpful ?