Hey fellow Diablo player! When facing bosses in the campaign, it’s crucial to understand their mechanics. Always be prepared with the right skills and gear to counter their attacks. For optimizing gear, focus on items that enhance your main stats and abilities. Don’t forget to socket your gear with appropriate gems for added bonuses. Efficient leveling is key – prioritize completing quests and bounties for exp. Also, consider running rifts and greater rifts for fast leveling and loot. Good luck on your campaign journey!