For example, if a casino offers 100% bonus up to $100 free, and it has the following condition in its bonus rules:

“To withdraw winnings you must wager your deposit plus bonus 30 times”

So, if you make a deposit of $100 you will receive $100 bonus, and you will need to wager your deposit + your bonus 30 times: ($100+$100)x30=$6000 must be wagered in this online casino.

Usually if you play slots or video poker wagering requirements are less than in blackjack or roulette.

I recommend you to read bonus rules carefully and understand them because almost all bonuses have excluded games. For example, some online casinos restrict to wager bonuses in Blackjack games or roulette. Of course, you can wager them in these games but you won’t be able to withdraw your bonuses because you won’t meet bonus rules. Some casinos offer separate bonuses like Slots bonuses, Blackjack bonuses, and if you want to play slots it’s better for you to take slots bonus.

I recommend you to take bonuses only in trusted online casinos, because unfair casinos can confiscate your winnings and close your account with the reason “Bonus abuse”.  I investigated a lot of casinos and know which casinos are trusted and which are not. I heard a lot of complaints from players, their winnings with their deposits were confiscated by rogue casinos and their accounts were closed.