The fastest way to learn Spanish, for instance, is by immersing yourself in a Spanish culture. Flash-cards for 15 minutes a day will eventually get you there. But you’ll make deeper connections with a few days fully immersed than you would in months of “dabbling.”
In this article, I define learning as a permanent change in cognition and or behavior. In other words, true learning involves a permanent change in how you see and act in the world. The accumulation of information isn’t learning.