Handling Transactions & Events

So far, you've learned how to connect your DApp to the blockchain and read data. But what if you want to change data or perform actions?

This lesson teaches you how to send transactions from your DApp to modify blockchain state and how to listen for real-time updates using smart contract events.

A blockchain transaction is a signed message that changes the state of the blockchain. Every transaction costs a small fee called gas, paid in Ether (ETH).

Common DApp transactions include:

• Sending Ether to another address.
• Calling a smart contract function that writes or modifies data.
• Deploying a new smart contract.