I'm all for diversification.

I've recommended to folks that get started on Coinbase - depending on whether it's available in their country - to either do 1/3 each, or 1/2 and 1/2 BTC and ETH.

Watch for a while, then move over to Poloniex, Bittrex, or Cryptopia and start trading. Don't be afraid of mucking it up a little - I sure did when I started.

There's also the automatic regular withdrawal option with Coinbase, where you just set it and forget it and do a little on a regular basis.

Go get 'em!