Here's my quick video overview of Synthetix (SNX). It's an exchange that uses derivatives of assets for its users to trade on-chain. This is a highly speculative and new financial technology, so tread carefully and do your research.
I'm not a financial professional and this is not advice. It's for information only.
Watch out for scams. A ton are going around. Make sure you are using official apps. Be careful where you donate. Never give out your seed phrases EVER!!