What is the easiest way to add an aggregate rating schema?
Quick Answer: Adding an aggregate rating schema markup enables Google to feature your review ratings. There are three ways to add this to your site: microdata, RDFa, and JSON-LD, with the last being the simplest and Google-recommended option for you (and can be done so manually). When adding this schema type, make sure to add a reviews page on your site, utilize a 5-point scale, and mark up all your pages gradually. And remember: don’t place your ratings on your homepage.