Before investing in a Bitcoin it's good to understand what it is. The technology under the hood of Bitcoin doesn't need to be understood to be able to use it just as you don't need to know what happens behind the scenes when you swipe your MasterCard, but if you're going to invest in cryptocurrencies it is a good idea to understand the fundamentals of how they work and why the technology is so revolutionary.
This video explains how blockchains and cryptocurrencies work in the easiest way possible. It's worth watching this 26-minute video if you want to know how crypto works.