To develop a decentralized application (dApp) on Testnet, you need $FNCY, the native asset of Testnet. Testnet $FNCY cannot be purchased on exchanges, so you must use the faucet service to receive the asset.
How to Receive Testnet $FNCY
Create a new wallet address using MetaMask or FNCY Wallet
Go to FNCY Testnet Faucet service and receive the Testnet $FNCY to the generated wallet address