Hey fellow Final Fantasy X explorer! When it comes to sphere grid progression, make sure to focus on unlocking key abilities first before branching out to other nodes. Prioritize HP, MP, and important stats for each character’s role. For side quests, don’t miss out on the Celestial Weapons and the Monster Arena for great rewards. And for character builds, customize each character to fit your playstyle – whether you want Tidus to be a speedy attacker or Lulu to focus on powerful magic. Happy exploring!