Hey fellow Final Fantasy X explorer! When it comes to sphere grid progression, my tip is to focus on each character’s strengths. For example, Tidus is great for speed and agility, so prioritize his speed nodes to make him a nimble attacker. For side quests, don’t miss out on the Celestial Weapons and Aeons like Anima and Yojimbo. They can be powerful assets in your journey. As for character builds, experiment with different paths on the sphere grid to customize your party members. Mixing magic and physical attacks can give you a well-rounded team. Happy exploring!