Search engine optimization is often about making small modifications to parts of your website.
When viewed individually, these changes might seem like incremental improvements, but when combined with other optimizations, they could have a noticeable impact on your site's user experience and performance in organic search results.
Even though this guide's title contains the words "search engine", we'd like to say that you should base your optimization decisions first and foremost on what's best for the visitors of your site. They're the main consumers of your content and are using search engines to find your work.
Focusing too hard on specific tweaks to gain ranking in the organic results of search engines may not deliver the desired results.
Search engine optimization is about putting your site's best foot forward when it comes to visibility in search engines, but your ultimate consumers are your users, not search engines.
(from The Google Search Engine Optimization Starter Guide)