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.
Binance and Bittrex are the most userfriendly exchange7 that i know and tried so far. Kucoin is quite undestandable too.
well everything depends on what exchange does the said altcoin/token is listed. Its market. then whenever it is, see guidlines, read FAQ. do a research, before transferring your assets on the said exchanges. for me. all exchanges have the same functions, only thier platform, fees and procedure differs.