Hey fellow Final Fantasy X explorer! When it comes to sphere grid progression, I recommend focusing on each character’s strengths. For example, Tidus is great for physical attacks, so prioritize nodes that enhance his strength and accuracy. For side quests, don’t miss the Celestial Weapons and Aeons. They are powerful assets in battles. As for character builds, experiment with different paths on the sphere grid to find what works best for your playstyle. Don’t be afraid to mix and match abilities to create versatile party members. Happy exploring!