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 like HP, MP, and stat boosts. For side quests, make sure to complete the Monster Arena challenges for some sweet rewards and tough battles. And for character builds, experiment with different paths on the sphere grid to customize your party members to your playstyle. Happy exploring!