Where can I find a full list of all the categories you can list your business in with GMB. I find different ones all the time that are relevant to my business and can't find some that should be there. Also how many categories should you have and can you have too many.
Google recommends choosing the fewest number of categories it takes to describe your overall core business for the best results: https://support.google.com/business/answer/3038177?hl=en
The full list of GMB categories is here: https://developers.google.com/my-business/content/categories