Pump and Dump: Usually the most common way for a newbie trader to get rekt. Mostly used by groups of whales that invest at the same time a big amount of money to a small coin to pump its price and encourage other traders to also invest out of fomo. After the price reaches a certain level they massively dump the coin and leave with all the profits.

Of course pump and dump is considered a fraud and market manipulation, you should avoid any illegal groups promising great profits from following this tactic.