Hey fellow FFX explorer! When it comes to sphere grid progression, I recommend focusing on your characters’ strengths. Don’t be afraid to mix and match different paths to create unique character builds. For side quests, be sure to complete the monster arena challenges and unlock ultimate weapons. These will greatly help in endgame content. As for character builds, consider customizing your sphere grid to fit your playstyle. Experiment with different abilities and see what works best for you. Happy exploring!