Hey fellow Diablo player! When facing bosses in the campaign, make sure to study their mechanics and have the right resistances and gear to counter their attacks. Always stock up on health potions and use crowd control skills to manage the adds during the fight. For optimizing gear, focus on getting items with stats that complement your build rather than just going for high damage numbers. And when leveling, try to complete all side quests for extra experience points and gear rewards. Happy hunting in Sanctuary!