Hey fellow Final Fantasy X explorer! When it comes to sphere grid progression, focus on unlocking key abilities for each character first before branching out. Don’t be afraid to backtrack to grab important nodes. For side quests, don’t miss out on the Celestial Weapons and monster arena challenges for great rewards. And for character builds, tailor each one to fit your playstyle – whether it’s focusing on magic, physical attacks, or support abilities. Experiment and have fun customizing your team! Good luck on your journey!