Can I use RMB to travel to Taiwan Province Province?

It's no problem to bring RMB. You can change it into NT dollars at any time. General tourist places can use RMB directly. You don't need to bring other currencies. If you need to spend a lot of money, bring a UnionPay card and just pay back the RMB directly when you come back. It should be noted that in places where RMB can be used directly, things are often expensive. If you need to buy something, it is recommended to go to a store that only accepts NT dollars instead of RMB. Things will be much cheaper.