Aggregrate Structured Data Shouldn’t Be Used On Category Pages
The aggregrate rating structured data should only be used for the same type of products, therefore John recommends not using it on category pages.
Avoid Implementing Structured Data Types Just Because Competitors Use Them
Even the most recognisable brands can get things wrong, so avoid copying structured data elements just because your competitor is using them, as you don’t know if they are actually valid or profitable for the competitor site.
Images Implemented Via Lazy Loading Can be Used Like Any Other Image on a Page
Images implemented via the lazy load script can be added to structured data and sitemaps without any issues, as long as they are embedded in a way that Googlebot is able to pick up.
Ensure Accordion FAQS Are Set up Correctly When Using Structured Markup
An accordion style format can be used with FAQ structured markup to expand the answers when clicked on, as long as the question is visible by default.
Using How To and Recipe Structured Markup Together is Fine
Using both How To and Recipe Structured Markup is fine, however Google will typically pick the most relevant one to show, depending on the intent of a user’s search.
Use the Rich Snippet Spam Result Form to Alert Google to Sites Misusing Structured Data
If you see sites appearing for rich snippets which are misusing structured data and going against Google’s guidelines, you can submit a Rich Snippet Spam Result form to alert Google.
Use Structured Data Testing Tool, Search Console Help Forum & Schema.org Documentation For Local Business Markup
For implementing local business markup, use the schema.org documentation to see which attributes are required, the Structured Data Testing Tool for testing that these work, and the Google Search Console forum for getting advice from peers.
Extending Structured Data With Additional Fields Helps Google Better Understand Entities
You won’t see direct performance increases from extending structured data with additional property fields from schema.org, but this can help to give Google more context around the entities on your site.
Google Will Pick One Primary Type of Structured Data To Display
If there are different structured data scripts on a page, Google is unable to display more than one type in search results so will only select one. John recommends defining the type you care about the most to focus on implementing.