Can someone make it trading only altcoins?
yes actually its possible but you need to learn how to read technical analysis before doing a trade I know a persons doing that and earn around 10-50% in daily trades h. But that's not always accurate that's why its important to have stop lost if you don't want to lose large amount in trading.
If you really interested learning it watch many tutorials or attend seminar to have ideas and learn how to do it.
You are misleading him. I would never suggest anyone to live off by trading only. There are a lot of risks involved with trading. You don't receive a steady flow of money by trading. What do you think will happen when the user does not manage to make any profit for a month or is in loss after several trades? It is going to be really hard for him to pay his bills.
10% - 50% profit everyday by trading? Sounds like bullshit to me.