Blockchain is a digital ledger where data is stored in blocks.
These blocks are secure, connected, and cannot be changed.
Web3 is a new internet where users control their data.
It runs on blockchain and uses smart contracts for trust.
Solidity is the coding language for smart contracts.
It's simple to learn and runs mainly on Ethereum.
Use Remix to write and test smart contracts online.
Tools like MetaMask and Hardhat make building easier.