Verifying your site with Google
Getting your site listed on Google and keeping an eye on how you're doing is very important. One of the things you're likely to want to do to help this is to register yourself with Google Search Console.
This allows you to submit your site's Sitemap to Google and to keep an eye on which search terms your visitors have used to find you.
You'll then be asked to Verify that you own your domain/website. Google provides a number of ways for you to do this, but in this case you are most likely to want to use the second option, HTML Tag.
The Meta Tag Google provides you with will look something like
<meta name="google-site-verification" content="abcsomelongrandomstringofcharactersxyz">
It's composed of two parts - a name, 'google-site-verification' and a random string in the content section - in this case all the characters starting with a and ending with z.
To add the meta tag to your site open it in a new window and log in. Go to Dashboard -> Site Settings -> Advanced Settings.
About halfway down the page you'll find a section titled Site Meta Tags. Click Add Meta Tag and follow the instructions.
Once you've saved the meta tag, go back to the Google Console window and click the Verify button in the HTML Tag area. If you've added the tag correctly then Google should now tell you the verification was successful.