Implementation is where a recommendation becomes a change on the site: a template edited, a redirect added, structured data written, a canonical corrected. Google's documentation is mostly about what a correct result looks like, and it points to tools for checking. The URL Inspection tool in Search Console lets you check how Google sees a specific URL. Google's structured data introduction advises checking markup with the Rich Results Test during development and monitoring it afterwards with the rich result status reports.
The site move guide shows the same habit for redirects: test them with the URL Inspection tool for single URLs, or with command line tools or scripts for large numbers. Google's JavaScript troubleshooting guidance likewise suggests testing how Google crawls and renders a URL when content fails to appear, and collecting and auditing the JavaScript errors that users, including Googlebot, encounter.
The point is that a change is not finished when it is deployed; it is finished when it has been checked on the live site. We cover technical SEO implementation: templates, redirects, structured data and tooling built by us where that is faster than waiting on a queue, or written up as tickets with the fault, the evidence, the fix and the acceptance test for your developers. Releases are checked before and after launch. See implementation and QA and our article on audit findings that get implemented.