Hey fellow FFX 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, be sure to complete the Monster Arena challenges for great rewards and tough battles. Also, don’t miss the Celestial Weapons quests for ultimate gear. As for character builds, tailor each one to their strengths – Tidus for speed and agility, Yuna for magic, and Auron for brute strength. Experiment to find the best combos for your playstyle! Happy exploring!