Hey fellow Final Fantasy X explorer! When it comes to sphere grid progression, make sure to focus on each character’s strengths. For example, Tidus is great for physical attacks, so prioritize nodes that enhance his strength and agility. For side quests, don’t miss out on the Monster Arena for challenging battles and unique rewards. As for character builds, consider mixing and matching different paths on the sphere grid to create versatile characters. Experiment with different strategies to find what works best for your playstyle. Happy exploring!