Hey fellow Final Fantasy X explorer! When it comes to sphere grid progression, focus on unlocking key abilities like Quick Hit for Tidus, Doublecast for Yuna, and Quick Pockets for Rikku. Don’t be afraid to mix and match different paths to create unique character builds.

For side quests, make sure to complete the Monster Arena challenges for valuable rewards and unlock ultimate weapons. Don’t forget to participate in the Butterfly Hunt in Macalania Woods for rare items and AP. Lastly, aim to defeat all the Dark Aeons for the ultimate challenge and satisfaction.

Remember, it’s all about finding a balance between offense, defense, and utility on the sphere grid. Experiment with different strategies to see what works best for your playstyle. Happy exploring!