personally I do not really believe in pumps and dump groups, because no one will help voluntarily and bear the big losses for the sake of people who have never been known before, so they are still trying to make a profit.
Pump and dumps groups really exists but that is only applicable and effective for "limited altcoins" that can shaken be up for a range
BTC.5 to
BTC1 "in general" and that will also depend on the exchange where that altcoin is traded. But for that to make it successful all subscribers must joined the party but I doubt all of that will.
For some people, they are comfortable joining those groups but for others they have an opposite insights. So for a newbie, why trust others if we can do analyzations on our own. Once a newbie is progressing, they will automatically knows what things should they do to deal with that kind of concern so just be serious learning all aspects about crypto trading.