Category descriptions are normally short texts to describe a particular type of product. This is not generic content since category descriptions should sell by nature; unlike a product description that normally would mention a specific product, brand or campaign.
The most common issue with this type of content is that it contains too much information about other things than the actual category, or the text resembles an article or a guide.
A category description should always introduce what the category is about by describing the products in an evergreen manner without mentioning campaigns, specific brands, or prices, which may change over time. To be successful, you have to read carefully the instructions for each particular task, and you must follow this specific method of work