ETH can be easily exchanged/converted to any other Ethereum based tokens (e.g. DAI, USDC, OXT, BAT, etc.) by using a really convenient, quick, and easy to use Ethereum blockchain application called Uniswap.
You will need to already have setup your MetaMask wallet and have some ETH on it to be able to exchange ETH on Uniswap. If you haven't already setup your MetaMask wallet or don't know what MetaMask is or why you need it, please visit: FAQ, MetaMask, before continuing.