Hello, since I'm a professional seo
, I can answer you.
SEO Yoast is a WordPress plugin that helps you check that your publications (pages or posts) comply with certain guidelines from search engines so that they can position your website in the first positions of the search results (SERP's). Actually, by itself it doesn't make Google position you better or worse, but it tells you what to do. Sometimes the public thinks that by following the guidelines set by the plugin, it will automatically work its magic and you will appear first in searches. This is not the case. The plugin just "checks" that you comply with the guidelines. Nothing else.