These settings help search engines pull up results for your site. Social media platforms will also pull from these settings to build your site preview to share. These settings exist on each page you have in your site and will need to be filled out for each page.

The title of your website is very important as it describes what is in the page content and typically included in a search result. This title should be concise with the keywords of who you are. (Google shows only 65 characters in title)

This is the description of the page and is typically included as the paragraph under a search result that describes the content of the page.  This isn’t necessarily used to index the content but is important for how results are previewed and encourages readers to click on the link. If you can organically & naturally use any key words here, feel free to do so!

Social platforms will pull the SEO title and description from your site as well as the share image set there in order to build your share preview. 

If your preview isn't showing correctly on Facebook specifically, you may need to use their debugger tool in order to get that preview showing correctly on the Facebook platform.