Study it first, don't decide on anything unless you know how to.
He simply wants to buy Altcoins, not implement comprehensive trading strategies. So don't think that he has to prepare himself with simulators and co. 
The fact alone that this question has to be asked shows for me that the exchanges are still far away from being able to be used by people who are not so technically versed. In my opinion, Bitpanda is going a very good way here. There is exactly one button in the app with "Buy" or "Sell". There are no overloaded UIs, no additional settings etc. and can therefore be used by all user groups:
I haven't used Bitpanda, the UI of their app looks nice and I think user-friendly. I'll get to try it and then suggest it to others as well.