Google Search Console: Webmaster Tools from Google
Google Search Console, formerly Google Webmaster Tools, is a free online tool by Google that helps you track your website’s presence in Google’s search results and in Google Discover. For technical SEO, it is a definitive source of information. For smaller sites, manual work with the Search Console can even replace certain technical SEO tools.
The Search Console reports on the number of times a page from the website appeared in the search results and the number of times a page in the search results was clicked. For each Google query your site appears in the results for, you can see the average position of your site, which helps you identify the most profitable keywords on your site.
It can be less helpful for long-tail queries, though: queries with few searches or few clicks may contain identifying information; for compliance reasons, these queries can not be inspected in the Search Console.
It also provides access to technical SEO information on individual pages of the website, such as the canonical URL chosen by Google, the dates of the last crawl, the type of Googlebot that explored the page, as well as data on mobile friendliness and on search result enhancements based on Schema.org markup.