I was away from crypto for years and now I'm trying to get back into the game. I was really STUNNED that there is no exchange, even after many years since bitcoin started, that we can just deposit USD and start exchanging altcoins. I hope I'm wrong because this would be the single biggest hurdle for altcoins to be widely adopted by general public. There are just too many hurdles to jump over just to START trading.
When i was a beginner. I was used binance excange. Before using this exchange i had research many thing about this in this forum. Everyone given trusted feedback about binance exchange. Thats why i used this exchange. Still now i using this.