coinbase/coinbasepro are the easiest to use
binance is the one with the largest selection of non-scam coins
Your flag is Brazil and idk the laws there but KuCoin doesnt require KYC and allows for margin trading of certain cryptos as well as ones that are banned in USA (maybe elsewhere idk) such as XRP.
In Brazil Binance if you want to buy coin yourself, Vitreo cripto funds if you want other people to administrate and negotiate coins for you
imagine wasting time on this huge fantasy just to get a few bucks