The Diamond Casino Heist in GTA Online offers an exciting opportunity for players to earn big rewards. Beginners should start by gathering a solid crew and selecting the right approach—stealth or aggressive. Familiarize yourself with the layout of the casino and plan your entry and exit strategies. Completing prep missions is crucial for gathering necessary equipment and intel. Communication with your team is key to executing the heist smoothly. Remember to stay calm during the heist, and don’t forget to split the loot fairly afterward. With practice, you’ll master this thrilling heist in no time!