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.
Even the listing fee will also be high in centralized exchanges compared to decentralized exchanges, of course, newbies are finding it difficult to trade on centralized exchanges but with the decentralized exchanges the only problem most of the coins are from the ETH block chain. Due to the price of ETH, many companies already lost their value.