Congrats on creating your first store!
It looks like something happened with the theme code. Is this something you were editing, or did you have someone else working on the store for you?
If it’s a theme from the Shopify Theme Store, you may be able to roll back to an older version of the theme code. Alternatively, you can install a new copy of the theme to troubleshoot. This will help us determine whether the issue is with this specific theme, or whether it is wider spread.