If you search at the google about bitcoin for criminals, there is a lot. For example at this link https://www.thesun.co.uk/tech/5092224/criminals-use-bitcoin-for-dark-web-illegal-activity/amp/. So if there is nothing correct regulations, maybe a lot of countries will be block this payment system. And as the effects, price of BTC will be drop soon. So let's start to discuss, what it the right regulations to avoid Bitcoin used as a payment for crime.
You have to know first what you want to know about Bitcoin or Cryptocurrency, read and know more is your capital to start, some exchanges are very important for you to choose because that will be your determinant in the deep time.