Focus mode
When deploying to Testnets, you will hear the concept of faucets. A faucet is a web application that will send your wallet address a certain amount of test ETH. Test ETH allows you to understand that the contract you have prepared is working correctly by paying the gas fee you need to pay to perform transactions with test ETHs and distribute your contract, without using the real ETHs in your wallet. After you make sure that the system is working correctly, you deploy it on the Mainnet and pay the transaction and gas fees.
Each testnet has a different set of faucet options. Rinkeby, Goerli, Kovan, Ropsten are most commonly used Testnets.
Following this tutorial will explain how you can add test ETH from a faucet for the Goerli Testnet: https://www.youtube.com/watch?v=odD29qGrdtQ
Setting up a Metamask wallet for Rinkeby Testnet: https://www.youtube.com/watch?v=Wk9W01KI4RU
Resources:
https://moralis.io/ethereum-testnet-guide-connect-to-ethereum-testnets/
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