When creating your RSS feed (with Libsyn at least), you're able to select three category options.
However, most apps/platforms will only recognize the first category selection that is listed in the feed so make sure it's the most relevant one.
There are two options for categories; Main and Sub-Categories. I recommend selecting entirely sub-categories if you can.
Below are the current categories available in Apple Podcasts as of July 22, 2019.
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