Mastering Blockchain Programming with Solidity

Testnets

There are multiple testnets available where you can deploy and test your contract's functionality. These testnets are the replica of the mainnet (production) Ethereum blockchain, so these testnets also behave the same. If your contracts are working on testnets, then they will work perfectly on the mainnet as well.

However, to deploy and test your contracts on these testnets, you need to have some testnet ethers for that testnet. You can get those testnet ethers from a faucet for free from the following locations:

Testnet	Faucet link	Block explorer
Kovan	https://faucet.kovan.network/	https://kovan.etherscan.io/
Rinkeby	https://faucet.rinkeby.io/	https://rinkeby.etherscan.io/
Ropsten	https://faucet.metamask.io/	https://ropsten.etherscan.io/ ...