I am going to be starting up a classified site about puppies and was looking for an easy way to add many different categories quickly. Here is an example of what I want to do. Main categories will be the state Florida Then sub categories will be the breed of the puppy Yorkie. And the final URL I want it to read "buy Yorkie puppies in Ohio" Any ideas or suggestions would be great. Thanks
I'd keep your categories to a single theme - either geography or breed, let's say geography. Create a custom taxonomy for the other one, in this case breed Then when you create a post you give it the category of Ohio and the custom taxonomy of Yorkie And you'd create a filter that creates smart headings when Ohio + Yorkie are displayed. You might need to create something clever to allow search on both, it's a while since I've messed with custom taxonomy but this is the "right way" to tackle the problem.
I'd advise you against starting a classifieds about puppies. Your site will quickly get filled with nothing but fake puppies for sale ads. I pretty much block all puppies for sale ads and approve them manually. If you don't mind dealing with spam, which will be 95% of your ads, then by all means start a classifieds about puppies.
That too, puppy mills are also a real problem. If you can personally validate every breeder then your site will be amazing but I doubt you'll have the time to vet every breeder. It's also a very competitive niche, but that's a whole other issue https://www.google.com/search?q=buy+yorkie+in+ohio