BR AcademyFree course

Intro to Blockchain: How It Works and Why It Matters

Free intro to blockchain: blocks, hashes, keys, transactions, consensus, smart contracts, and how to evaluate any protocol.

Beginner25 lessons5.7 hoursCertificate

About this course

Blockchain is everywhere—but how does it actually work?

This free course is your complete introduction to blockchain fundamentals. No hype, no marketing, no prerequisites. You’ll learn what a blockchain is, why it’s different from a database, and how it actually solves problems.

Over 7 modules and 25 lessons, you’ll:
– Understand blocks, hashes, and cryptographic linking
– Learn how public and private keys work and why they matter
– Trace a real transaction from wallet to confirmation
– Compare Proof of Work and Proof of Stake
– Explore smart contracts and tokens
– Read a block explorer and find real on-chain data
– Evaluate any blockchain protocol using a repeatable framework

Each lesson includes a worked example and a hands-on exercise. You’ll quiz yourself after each module and complete a capstone project analyzing a real blockchain.

By the end, you’ll have the foundation to understand any blockchain conversation—and you’ll know whether to go deeper into Solidity, staking, or DeFi.

Start free. Go as deep as you want.

What you will be able to do

Can explain what a blockchain is and why it's different from a database
Can describe how blocks, hashes, and cryptographic linking create immutability
Can explain public/private keys and why they matter for ownership
Can trace a transaction from wallet to confirmation and calculate fees
Can compare PoW and PoS consensus and explain why consensus matters
Can describe what a smart contract is and how tokens work on-chain
Can read a block explorer and find real transaction data
Can evaluate any blockchain protocol using a repeatable framework

Curriculum 7 modules · 25 lessons

1What Is Blockchain?4 lessons

2Blocks, Hashes, and Cryptography4 lessons

3Keys, Wallets, and Ownership4 lessons

4Transactions and Fees4 lessons

5Consensus and Security4 lessons

6Smart Contracts and Tokens4 lessons

7Capstone u2014 Evaluate a Protocol1 lesson

Evaluate Any Blockchain Protocol 60 min

Taught by Block Relations

Research & Education · Built for a curious beginner with no crypto or technical background who wants to understand what blockchain is, how it actually works (not marketing), and whether it matters to them.