For the rich pins Validation, do I have to submit my blog page’s URL or only one blog Post’s URL?? After the 1st validation, do I have to do it for every new blog post?

–>Ideally you want to submit any one blog post URL as you are activating article pins. There is no need to do for every new blog post. If you do it once and the validator says that rich pins are activated, you’re good after that!