Scams

There are many scammers out there be careful.

Pump and dump scams
Taking a penny stock or a cryptocurrency and making outlandish claims about how it is going to the moon to get others to bump up the price

Multi-level marketing scheme
People are brainwashed into thinking they can make a lot of money buying overpriced energy drinks, health foods, knives and such and try to sell them or enlist other people as "distributors".

Pyramid/Ponzi schemes
In a pyramid scheme new members must pay a fee and people make money recruiting other members, in a ponzi scheme people are promised returns on their investment but the only money going into the pot comes from recruiting new members with hilarious consequences

Gambling
The stock market can be used as a platform for gambling or to lure people into scams, people with gambling addictions should avoid trading on the stock market for the months needed for such a psychological problem to heal. FOREX scams and Timothy Sykes spring to mind.