I want to make shop in your platform. I have a few question about your offer.
I want to make global shop. So Can I add US Dollar and Euro as currency for payment ?
The next question. In Europe are various VAT rates. It is possible to add a plugin which will increase the amount of the product with VAT ? If the customer indicates that he is from the United States, his amount will not change. However, if a customer from Great Britain wants to buy a product, the price will be 20% higher, because that's the amount of VAT.
Yes, you can add and accept multiple currencies but you will need a payment gateway that supports it.
Yes, Magento supports different tax rates. You can set them up based on shipping location. There are numerous pages in the documentation linked from here are useful http://docs.magento.com/m2/ce/user_guide/tax/taxes.html