Hello. Can anyone tell me about the difference between NetSuite Solution Providers partner, Developer partner, and BPO Partner? I have checked the partner's page but I am still confused. Or should I contact NetSuite about it?

If you want be one, you need to contact them anyway :)

Solution Providers are resellers and implementation partners/ developers are just that / BPO is Business Process Outsourcing. Unless you have significant experience in any of them they are very particular

Thanks @Chap Moore and @PNJ. Happy New Year!