Hey there fellow Nephalem! When facing bosses in Diablo III, make sure to understand their mechanics and have the right build to counter them. Always prioritize survivability stats like Vitality and Resistances, and don’t forget crowd control skills to manage the adds. For optimizing gear, focus on critical hit chance/damage, elemental damage bonuses, and cooldown reduction based on your build. Don’t underestimate the power of set bonuses and legendary affixes! Lastly, for efficient leveling, consider running Rifts or Bounties on higher difficulties for better experience gains. And don’t forget to upgrade your Blacksmith and Mystic to craft and enchant gear as you progress. Happy demon slaying!