Bitcoin

Bitcoin is an experimental new digital currency that enables instant payments to anyone, anywhere in the world. Bitcoin uses peer-to-peer technology to operate with no central authority: managing transactions and issuing money are carried out collectively by the network. Bitcoin Core is the name of open source software which enables the use of this currency.

A good starting point can be found here

Some

• Bitcoin.org
• Bitcoin.com
• Bitcoin Wikipedia
• Bitcoin Wiki
• WeUseCoins.com
• History of Bitcoin

Community

• Bitcoin Reddit
• Bitcoin Magazine

Tutorial

• What is Bitcoin?

Book

• Mastering Bitcoin
• Bitcoin for Befuddled
• Understanding Bitcoin
• Bitcoin Essential

Blockchain

• Ethereum
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