Hey fellow Final Fantasy X explorer! When it comes to sphere grid progression, my tip is to focus on each character’s strengths. Make sure to unlock key abilities like Quick Hit for Tidus or Holy for Yuna early on. For side quests, don’t miss out on the Celestial Weapons and Aeons like Anima and the Magus Sisters. As for character builds, experiment with different paths on the sphere grid to customize your party members to your playstyle. Have fun exploring Spira!