If you have a good structure in your blog, readers will find your content easily, therefore, they can return to your site with ease without having to get lost. WordPress even makes it easier through categorizing each content based on where you put it. So, if you have a lot of categories in your blog, you might be misinterpreting a category from a tag.
Also, you might be stuffing with a lot of keywords in your category which might affect your site in the future.
If you’re not certain if you are naming your categories right, this article will give you an in-depth explaanation about the do’s and don’ts of creating a category and how to make it more reader-friendly.