Anything other than signature campaigns and gambling.
A bit saved is a bit earned. So save your money by not clicking on any of the signatures of the people posting in this thread.
If asside from those things then ypunare probably talking about the trading because the trading is also profitable but very risky because you cannot know if the coins will fall and will give you a huge profits or not. But it depends on the person if they have the guts to pursue it. Losing in that is just part of being a trader because in life we always lose and that will serve as a lesson so next time you will not do it again