Deposits: There are generally two ways to claim a bonus, depending on the casino. In the simpler setup, you choose a bonus before making your deposit, from a list of available offers. In other cases, you need to claim the bonus manually after you deposit.
In both scenarios, one rule always applies: you must claim the bonus before you start playing. If you deposit and begin wagering without opting in, you almost certainly lose the right to receive that bonus.
Also, some casinos exclude certain payment methods from bonus eligibility. A common example is that deposits made with Skrill or Neteller do not qualify for bonuses at specific casinos.
One IP address – one player!
Roughly 99% of online casinos allow only one bonus-eligible account per household or IP address. In many cases you can technically register multiple accounts from the same IP and even receive a bonus, but any winnings are very likely to be confiscated later.
The same applies to players using a VPN, as casinos treat this as a potential bonus-abuse risk.