Etherdelta and Forkdelta are old and famous decentralized exchanges right now. You can exchange Ethereum and ERC-20 tokens on those exchanges. The Binance DEX is a good decentralized exchange. Because Binance DEX is Binance. You all know about Binance. You can exchange BNB and BEP-2 tokens on Binance DEX. The Binanve DEX has BNB, BTC and fiat trading pairs.
Yeah, I think most of the newbies had experienced trading with exchanges for aquinting with new others exchanges. But unforunately I think that there are only few people are trading and with lower market volume other than centralised exchanges out in thea market or project developers are no longer listing their token with them.