Before exchanging his Wisdom points for Wisdom chests, Aizen first used them to learn the basic blade technique. This learning process was a shortcut, achieved using Wisdom points directly. Otherwise, practicing the basic foundations of blade techniques would have taken months of rigorous hard work, and even then, it would take a year before seeing significant improvement.
After spending another 100 Wisdom points, in addition to the points he had already used on basic movement and finger techniques, Aizen was left with only 1,200 Wisdom points. He suspected that Wisdom points would be of great use later, particularly when learning higher-level techniques. The more powerful the Sorcery arts, the more points would likely be needed to learn them quickly. Therefore, it was crucial to start saving Wisdom points now.