Canonical URLs: A Beginner’s Guide to Canonical TagsThis guide will help you use canonical tags and URLs properly as part of your SEO strategy, you need to understand what they are, how they work, and how to implement them on your site and different CMSs. Also, see common reasons why duplicate content exists and how to deal with it.
Cumulative Layout Shift measures the total amount of layout shifts that occur on a web page as it loads and is interacted with. Google measures CLS in order to judge the overall page experience alongside the other two core web vitals, First Input Delay (FID) and Largest Contentful Paint (LCP).
Alongside Largest Contentful Paint (LCP) and Cumulative Layout Shift (CLS), First Input Delay is one of the three core web vitals Google is emphasizing in its Page Experience Update rolled out in Summer 2021.