# Crypto knowledge 

*🚀 Crypto Basics You Should Know
🔐 1. What Is Cryptocurrency?
Cryptocurrency is digital money that lives on the internet — it’s decentralized, meaning no bank or government controls it. The most famous one? Bitcoin (BTC).

🧠 2. What Is Blockchain?
A blockchain is like a digital notebook that records every transaction. It's:

Public (everyone can see it)

Permanent (you can't erase)

Decentralized (many computers keep a copy)

💼 3. What Is a Wallet?
A crypto wallet lets you:

Store your crypto

Send & receive tokens

Access the blockchain

There are 2 types:

Hot wallets (like Coinbase Wallet, Phantom, MetaMask — connected to the internet)

Cold wallets (hardware wallets like Ledger — offline, more secure)

🧾 4. What Is a Seed Phrase / Private Key?
It’s like the master key to your wallet.

12 or 24 secret words (e.g., “apple mango rocket...”)

Whoever has this can access your wallet
✅ NEVER share it
❌ If you lose it, your crypto is gone forever

📉 5. What Affects Crypto Prices?
Supply & demand

News (good or bad)

Big investors (called whales 🐋)

Government regulation

💸 6. What Is Gas Fee?
A fee you pay to send or swap crypto. It goes to the computers (miners/validators) that keep the network running.

🧩 7. Popular Blockchains
Bitcoin (BTC) – digital gold

Ethereum (ETH) – smart contracts + NFTs

Solana (SOL) – fast, low fees

Sui, Aptos, Arbitrum – newer chains with strong developer communities

🤖 8. What Is DeFi?
Decentralized Finance = using crypto for things like:

Lending

Borrowing

Swapping tokens

Without needing a bank. Just your wallet and a dApp (like Uniswap or PancakeSwap).*

By [nansui.base](https://paragraph.com/@nansui) · 2025-07-24

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*Originally published on [nansui.base](https://paragraph.com/@nansui/crypto-knowledge)*