The goal of technical SEO is to reduce all possible barriers that are making it difficult for search engines to discover pages, images, and other files that you want shown on search engine result pages.
But this is not realistic, for example:
clients have budget constraints
correcting legacy issues are cost-prohibitive and requires buy-in from stakeholders who are not involved in the current remit
inadequate development or engineering resources.
Therefore, your job is to (i) identify all possible issues, then (ii) highlight mission-critical technical SEO issues and this checklist will allow you to do so.