Hey there! When facing Diablo bosses, make sure to always be prepared with the right gear and skills. Study their attack patterns to know when to dodge or use defensive skills. For optimizing gear, focus on critical hit chance, critical hit damage, and cooldown reduction for maximum damage output. Don’t forget to socket your gear with appropriate gems for added bonuses. When leveling, prioritize completing quests and bounties for extra experience points. Lastly, don’t rush through the campaign – take your time to explore and level up before facing tougher bosses. Good luck, Nephalem!