Here is what I have learned:1. Wagering requirementsAlways check if the wager is applied to bonus or to bonus+deposit. In second case you'll have to bet 2 times more if you take 100% bonus and 3 times more for 50% etc.2. Game restrictionsMany casinos have restrictions on games you can play with active bonus. Some games won't contribute or contribute less towards wagering requirements and in some casinos your bonus will be canceled after you play certain games.3. Maximum betAlways check maximum allowed bet. Normally, you won't be allowed to ber more than $5-10. This is another reason to cancel a bonus.