Titles for SEO
Page titles are maybe the most important thing for SEO as they determine how your results are displayed in search results.
You can set a title in Settings → General and you'll see a preview of how it will get displayed in search engines. For a great title you'll have to make different trade-offs:
It needs to have great keywords for SEO as well as describe your page very well.
It needs to be long enough to be unique but small enough to fit on every device.

Per Page
You can set specific page titles for every page in the page settings or it will fallback to the general site title.
Unique Titles for CMS Pages
For CMS pages, you're able to add data from your CMS fields into your page titles using {{ }}. This allows you to set unique titles using any plain text field in your CMS collection.
