It's a good idea to ask all of your users to fill out their user profiles, including bio and social links. These will populate rich structured data for posts and generally create more opportunities for themes to fully populate their design
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Publishing with Ghost gives you full ownership and access to your content and data, with sensible JSON exports available at any time.
Adding some design touches to your Ghost publication can be done from the Admin page when logged in to your publication. From here you can add navigation and upload a custom theme.