Meta tags are used to list the title and description of a site for SEO purposes for better search engine visibility.
Please follow this doc to set the Meta tag for your Pages.
1: Go to your site pages: Let's take example of Home Page. Site > Pages> Home Page. And click on the Edit icon.
2: You will get redirected to the page editor. Click on the drop-down icon on the top right of your editor page. You find an option Page settings, click on this link.
3: Enter your Page Title, Page Meta Description & Page Meta Keywords(comma separated) in the corresponding fields.
4: Here is an example to show you how the title tag will be listed on search engines, for online school MyMusicTheory.