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:
100% true my friend. We are all so used to exchanges that when companies build solutions,,, they think this is "easy" and "seamless". It is not for a lot of people,,, what more to say for those totally new to crypto.
Never use this app you mention but I agree. Keep it to Buy and Sell. Everybody understands this.