Other networks are test networks. The ETH and OCEAN tokens in each of these networks don't have real value. The tokens are simply stand-ins to be able to test. They have "faucets" to dole out ETH and OCEAN.
- **ETH** [ETH faucet for Rinkeby](https://faucet.rinkeby.io/). You may find others by [searching](https://www.google.com/search?q=rinkeby+ether+faucet&oq=rinkeby+ether+faucet).
Ropsten has a faucet to dole out ETH, and another for OCEAN.
- **ETH.** [Here's an ETH faucet](https://faucet.dimensions.network/) for Ropsten. You may find others by [searching](https://www.google.com/search?q=ropsten+ether+faucet&oq=ropsten+ether+faucet).
- **OCEAN.** [Here's an OCEAN faucet](https://faucet.ropsten.oceanprotocol.com) for Rinkeby.
- **ETH.** By default, Ganache creates several Ethereum accounts at launch, gives each some ETH, and makes their private keys available in the logs. You can also instruct Ganache to give ETH to specific Ethereum addresses.