There are several good crypto exchanges, and its up to you to choose the best one. Binance is a good exchange, but it doesnt accept fiats which is a critical issue for me. I prefer CEX you can use both crypto and fiat there (
https://cex.io/dash-eur,
https://cex.io/dash-btc). CEX has a good level of security and a high trading volume.
Like you have said, yes there are so many exchanges. You only need to research about them and then see which one would suit your best, that is yours. Learn best practices and earn more.