How to buy GRT in USA?

I'm curious about investing in the cryptocurrency world, and GRT seems to be gaining a lot of attention. Could you please enlighten me on how to buy GRT in the USA? I'm not very familiar with the crypto exchanges and wallets, so a step-by-step guide would be really helpful. Also, I'd like to know if there are any specific regulations or tax implications that I should be aware of before making the purchase. Could you please provide some insights into that as well? Thank you in advance for your assistance.