what is the best and safe sites to trade crypto coines based on your experience
Coinbase, reputable and ability to direct deposit thru USD, they also insured your deposits
Bittrex, though have some issues on new users at my first attempt they've address it and they answer you thru support
Poloniex, My first experience on trading, have read some nightmare incident on some users I might be lucky didn't encountered it
just choose the most reputable and big trading sites, however they are not all hack proof, so I consider them one of the risk when using them