Learn about Bitcoin and the Lightning Network
Start here for Bitcoin and then here for the Lightning Network.
Bitcoin is a digital currency without a central bank. It's slow, has high fees and can achieve roughly 7 transactions per second. Think of it like a Real-time gross settlement system used for high value transactions.
The Lightning Network builds on Bitcoin to enable fast, low cost and small transactions. Think of it like the UK's Faster Payments Service or Canada's Interac.