Screenshot of Google's best practice tips for mobile-first indexing changes

Includes information pertaining to different website types and what they ought to do now that Google has rolled out “mobile-first” indexing.
Such as: your site is not going to be impacted if it is a) Desktop only b) Responsive Web Design or c) Canonical AMP
You need to make changes if your site type is a) Separate URLs b) Dynamic serving or c) AMP and non-AMP