I started buying Alt Coins/Crypto Currencies few months ago. And oh man ! I felt like ripped off by the fees on Coinbase. Effective fees/ charges are 2% on buying and 2% on selling if you are using Coinbase web application. To understand the magnitude of the fees consider buying 1 BitCoin for $2500 and selling it at the same price and you end up paying $100 in fees !!!!!
And still I kept using the Coinbase application.Relatively I might be stupid as some of you might have a better way to avoid heavy fees but still some of you might be using Coinbase and paying the gigantic fees.
So if you want to save on fees, don`t use Coinbase for buying or selling rather use GDAX exchange where fees are minimum. You can thank me later for this advise :)
And the other question is how to buy the other Alt coins - open an account with Bittrex, transfer the altcoins from Coinbase/GDAX to Bittrex and you are all set to buy/sell different crypto-currencies.
All the best and wish you all the profits !