One of the front line exchange trading crypto-Currency in the market Bittrex is one.
Securitywise is excellent, it has a very good backup.
One of the best feature that catches my attention, is the offline store of crypto they have, large percentage of there crypto are store offline, You trading on their site, you can not misfuntion because their is a stoppage order for every transactions.
Bittrex is a well done job , Go for it and experience good services.
But always let it be at the back of your mind that trading on this platform, when its time for withdrew you can only withdraw in Dollars, Hoping they improve on that withdrew currency limit.