Even high thrusted coin are scam and pyramid these days. Every beginner of course should be careful. I do not suggest them to invest altcoins at the beginning.
Well they can invest in they know what they are doing or at least DYOR.
But the problem with most beginners right now is that they buy the hype and thinking that they can make easy money. But it is not the case, altcoins are still good, but you need to be very careful. I still prefer top ten altcoins so that the risk is not that big. As compare to those high risk high reward IEO/ICO, definitely not suited for beginners.