I'm already familiar with coinbase and Gdax but they only cover four coins at the moment.
What is a good exchange where I could buy and sell alt coins like Ripple, Dash, Monero, and Cardano?
Ideally, the fees will be zero or very low. Obviously I want something secure as well.
There sure are a lot of exchanges out there that are available for newbies like you. All you have to do is read or watch a video on yout on how to use that certain exchange. Exchanges like binance, bittrex, coinexchange, and more. The thing is, due to proce increase in bitcoin, the terms on most of these sites have changed. And are asking a lot of information from their users now so that you can have an unlimited quantity of any currency to transfer for a specific time frame.