Digital assets are new infrastructure, not a shortcut to returns. Technology, custody and regulation in compact form.
3 lessons·~9 min read·Beginner friendly
What you'll learn
How blockchains, wallets and private keys work
What DeFi and staking offer, and what can go wrong
How EU regulation (MiCA) affects investors
How to approach a 24/7, high-volatility market
Lesson 01 · ~3 min read
What is cryptocurrency?
Cryptocurrency is a digital record of value on a decentralised network. There is no central bank that can 'print' Bitcoin. Instead, network participants (nodes, miners or validators) maintain consensus on who owns what, through cryptography and token economics.
Examples in this segment
BitcoinBTC
EthereumETH
SolanaSOL
TetherUSDT
Bitcoin (BTC) is the first and largest by market cap, with a digital gold narrative, fixed supply of 21 million and Proof-of-Work consensus. Ethereum (ETH) is a smart contract platform for DeFi, NFT and L2 ecosystem. Solana (SOL) targets high throughput and low fees.
A blockchain is a chain of transaction blocks. Each block references the previous one; changing history requires enormous computing power (PoW) or control of most stake (PoS). That does not mean 'unhackable'; it means a different risk profile from a bank.
Private key = ownership. There is no 'forgot my password' on a self-custody wallet. Exchange hacks, phishing and sending to the wrong address are all irreversible. 'Not your keys, not your coins' is not a meme but a lesson paid for in billions of losses.
Crypto markets run 24/7/365. Volatility of 5–10% daily on altcoins is not rare. Leverage on futures exchanges can liquidate a position within an hour.
Regulation is tightening: MiCA in the EU, SEC rulings in the US, tax on every taxable transaction in some jurisdictions. Compliance is not optional for serious investors.
Stablecoins (USDT) hold a peg to the dollar; reserve risk and de-peg events (UST/Luna 2022) show that 'stable' is not guaranteed.
NoteCrypto is speculative and technically complex. Only invest money you can afford to lose.
Lesson 02 · ~3 min read
DeFi – Decentralised finance
DeFi (Decentralized Finance) builds financial services on the blockchain: token swaps, collateralised lending, liquidity pools, synthetic assets. The intermediary is not a bank, but code (a smart contract) that is public on-chain.
Automated market maker (AMM) protocols like Uniswap use formulas (x*y=k) instead of order books. You deposit token pairs in a pool and earn part of trading fees, but are exposed to impermanent loss.
Lending protocols (Aave, Compound) let you deposit stablecoins and earn interest, or borrow with over-collateralization. Liquidation occurs if collateral value falls below the threshold.
Yield farming and 'APY 1000%' often include token rewards valued in a new currency; real yield is lower and unstable. Rug pulls and exploit hacks have destroyed billions in DeFi history.
Smart contract risk: a bug in the code = loss of funds. Audit does not guarantee safety. Composite protocol risk means one hack in the chain can pull everything down.
MiCA in the EU classifies stablecoins and CASP providers. DeFi remains a grey zone in many jurisdictions; legal certainty is lower than with a licensed broker.
DeFi is a laboratory of financial innovation, but also the Wild West. Start with small amounts and protocol understanding before large deposits.
NoteDeFi is not deposit insurance. A smart contract can fail with no compensation.
Lesson 03 · ~3 min read
Proof-of-Stake
Proof-of-Stake (PoS) replaces energy-intensive Proof-of-Work. Instead of ASIC miners and electricity, validators 'stake' (lock) the network's native token and gain the right to propose/validate blocks, with penalties (slashing) for bad behaviour.
Ethereum moved to PoS (The Merge, 2022), drastically reducing network energy use. Solana uses a PoS variant with high transactions per second, but with a history of network outages.
Staking rewards come from protocol inflation + transaction fees. Nominal APY varies; real return depends on token price during the period (reward in ETH that falls in price = negative real return).
Liquid staking (Lido stETH, Rocket Pool rETH) gives you a derivative token while ETH is staked, usable in DeFi but introduces additional smart contract risk.
Validator centralisation is a problem: too few entities control too much stake. Protocol-level censorship becomes a political issue.
Slashing is rare but real; a client bug or double sign can cost part of the stake. Running your own validator requires technical knowledge and uptime.
PoS does not solve all PoW problems; it changes the trade-off: less energy, more dependence on token distribution and governance.
NoteStaking rewards are not guaranteed income; the underlying token price dominates the final outcome.
Common questions
A shared ledger secured by cryptography, not a bank database. No single party can rewrite history easily.
Interactive section
Practice & market data
Select an instrument below to see its description, key risks and a real-time TradingView chart. Content is for educational purposes only.
BTCCrypto
Bitcoin
Bitcoin is the first decentralised digital currency, often called digital gold.
All content on this page is educational and does not constitute investment, legal or tax advice. Investing involves risk, including the loss of capital.
