The Paroli is a betting system. You start with the minimum bet. After a win you increase your bet. If you lose, you go on with the original bet. Thus you are "pyramiding" your wins.
Before starting to use the Paroli strategy, you’d better limit your maximum bet.
Now let’s see how the Paroli betting system works. For example, you make a $1 bet and win $1 and then you double your bet, it will be $2. If you win again, your next bet will be $4 and so on. If you lose you return to your original bet.