Where is it? Find the tutorial here.
What is it? An explanation on how you can create a simple blockchain using the Python programming language. Get to see how every block in the blockchain has a hash of the previous block, a timestamp, and transaction data which makes it tamper-proof. At the end you should understand the fundamentals of how cryptocurrencies work.
What you need to follow? The tutorial is best geared toward people with some prior programming knowledge, but those without should be able to follow along because of the tutorial's step by step nature. You will also need the Python program installed on your machine.