Your initial question is so poorly worded I cannot reply.
I assume that English is not your first language.
Your second question is an absurdity. It suggests that
you are imagining that you can learn a simple Level One
card counting system, waltz into a casino with a modest
amount of money and walk out with more money than you
walked in with.
The simple answer: your chances of losing all your money is
almost as high as your chances of doubling your money.
It is much more complex than that.
In fact, a veteran highly-skilled
well-bankrolled Card Counter will have
(over the LONG run) twice as many
winning sessions as he has losing sessions.
If you fail to fully understand that only a fool
attempts to "be" a Card Counter before spending
many months studying and practicing, you are doomed.