Hey fellow Final Fantasy X explorer! When it comes to sphere grid progression, my advice is to focus on unlocking key abilities first before branching out. Don’t be afraid to backtrack to grab stat boosts or new skills. For side quests, make sure to do the Monster Arena challenges for great rewards. And for character builds, consider specializing each party member to excel in certain roles like magic user, physical attacker, or support. Experiment with different paths on the sphere grid to find what works best for your playstyle. Happy exploring!