If you have allocated a descriptive text or a product category image or both to a
product category, and despite this neither is displayed in the preview or in the
online shop, then it could be that the selected design template does not support
displaying these properties.
If "Error 500" appears in the shop preview or in the online shop, then the reading
of your product category/product subcategory has exceeded the server's processing
time. Delete a few product categories or restructure them.