When you imported your local blockchain into MetaMask, you may have noticed that some public testnets are offered. These test nets are Ropsten, Kovan, Rinkeby, and Goerly. This section focuses on the Ropsten testnet. When learning how to build a Dapp on Ethereum, you can often spend a lot of test ETH. Therefore, I would like to show you how to add a large amount of funds to your testnet wallet for free. There are some so-called “faucets” that you can use. Two examples are the Ropsten Ethereum faucet and the Ropsten Ethereum (rETH) faucet. The first needs to drop 0.3 ETH every 10 seconds and the second, sends 5 ETH per request. All of this works just by pasting the test account address into the specified field (remember to switch to “Ropsten Testnet” within MetaMask [see image below]). Also note that transactions on the Ropsten testnet need to be mined, so they take longer to complete than using a local network.
If you want to use other testnets, use your favorite search engine to find a free ETH faucet that will fund those testnet accounts.