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 capturing monsters for the Monster Arena. As for character builds, experiment with different paths on the sphere grid to tailor each character to your playstyle. And remember, don’t neglect learning new abilities from the expert sphere grid if you’re feeling adventurous! Happy exploring!