To start investing in Bitcoin and other cryptocurrencies you first need to sign up to an exchange which will allow you to buy cryptocurrency with cash.
source https://www.google.com/url?rct=j&sa=t&url=https://hackernoon.com/the-beginners-guide-to-investing-in-bitcoin-cryptocurrency-getting-started-845958949e13&ct=ga&cd=CAIyGmM2Nzk3ODA2ZWViNjVjODI6Y29tOmVuOlVT&usg=AFQjCNFCLlDnLUdMKhwKRELamCaAf2rXSw
