Hey fellow Final Fantasy X explorer! When it comes to sphere grid progression, focus on unlocking key abilities and stat bonuses for each character. Don’t be afraid to backtrack to grab missed nodes or try alternative paths for different stat boosts. For side quests, make sure to complete the Monster Arena challenges for valuable rewards and the Celestial weapons for powerful upgrades. Experiment with different character builds by mixing and matching abilities from different paths to create a versatile team. Happy exploring!