Configuration
Here you can change the general settings for the website. Some are related to the presentation (Language, Title, Favicon, etc.), some to SEO (Description, Open Graph, etc.), some to PWA (Webmanifest). Go carefully through every setting and set them up to reflect the type of content you will be creating for the website.
Comments section allows you to modify a Comments button, which is placed at the end of a Post, if you provide a Comments link.
Socials are placed in the Footer.
These allow you to set the number of posts per page (or the number of related posts at the end of a Post) and the aspect ratio with dimensions for the cover images. Experiment with it to find an option to your liking or just leave as is, if everything looks fine to you already.
Next: Content management