Hey fellow Final Fantasy X explorer! When it comes to sphere grid progression, my advice is to focus on each character’s strengths. Don’t be afraid to mix and match abilities from different paths to create a well-rounded party. For side quests, be sure to complete the monster arena challenges for some great rewards. And don’t forget about the celestial weapons – they’re a game-changer! As for character builds, experiment with different paths to find what works best for your playstyle. Happy exploring!