Google Search Console is a free tool from Google that shows how your website actually appears in Google search: which of your pages Google has found, what people searched to see them, where you rank, and anything on the site Google could not read or index.
For a small business, this is the view from Google’s side of the glass. Google Analytics tells you what visitors do once they arrive; Search Console tells you what happened before that, in Google’s results, including the searches you are showing up for and the ones you are missing. It is also where Google warns you directly if a page drops out of search or hits a technical problem.
It is the first place I check on a build, because a page Google cannot find or read cannot appear in its results at all. Being readable is the floor, not a promise of ranking, and Search Console is where you confirm Google can actually read and index what you published. Setting it up is free and worth doing on any site you care about being found.