There's a couple ways to go about it. The most popular and efficient way is to purchase digital currencies from an exchange. These exchanges operate much like a stock exchange. It's a place to buy and sell digital currencies. Another option is going through an ATM. Much like you would use a regular ATM to access cash, there's ATMs specifically for cryptocurrency. Instead of being given actual coins, you'll receive the private key that will provide you with access to the funds that you've bought. According to an article, over 3,500 of these ATMs are around the globe in over 70 different countries.