Google finds sites on its own eventually, but you can introduce yourself and watch how you're doing. The tool is the free Google Search Console.
1. Go to search.google.com/search-console and sign in with a Google account.
2. Add your site address as a property.
3. Google asks you to prove you own it. The easiest beginner method: a small verification plugin or your theme's built-in field where you paste a code.
4. Once verified, find your sitemap address (often yoursite.com/sitemap.xml, created by your SEO plugin).
5. Submit that sitemap in Search Console, under Sitemaps.
A sitemap is just a map listing all your pages, so Google reads it like a table of contents.
In plain words: verify your site, hand Google your sitemap, then let it list your pages.
WP From Scratch
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Telling Google your site exists, step by step
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