The best way it's to choose something you know and like. So, if.you like some sport choose sport betting. If you are good i stategic things choose poker. In any case something that goes along with your character and interests.
Gambling at first should be fun, don't chase the money at any price that often leads to the dark side. Plan in advance funds you can spend on.gambling and try not to go over that line.
Indeed, the most common mistake players make is that they think of making money through gambling (which is mathematically impossible)
And why exactly is making money through gambling (e.g. dice) a mathematical impossibility?
As long as variance overrides the house edge, which is almost always the case with today's house edges of ~1% across the gambling landscape, there's nothing mathematically or, more correctly, statistically impossible in beating the house edge. And when you can beat the house edge, on the one hand, and not fall yourself victim to variance, on the other, you can make dough via gambling in a pretty consistent way. Not much, but profits are profits, no matter how small