I was recently studying this question and here is what I found:
- You can use Coinbase if you are in US and you will feel pain because of their fricking commissions
- You can use some exchanges like Bitfinex, Bittrex and some others but still the rate would be awful
- You can use new platforms like Cryptology and some others but there is no information on them atm but there might be the better rate
- You can use LocalBitcoins (which is banned in Russia)
What is your choice?
With the coming quantum technologies, the current market must experience many changes. To be more exact, many coins will leave the market, as there will simply be no demand for them, due to the same technological superiority. I hasten to remind you of revolutionary projects like Kelvin Blockchain. After all, its uniqueness lies in quantum computing! And this is an innovation!