Two types of thinking:
Practice makes permanent. Why?
Neurons become linked together through repeated use. The more abstract something is, e.g. a mathematical concept, the more important it is to practice in order to bring those ideas into reality (the pattern becomes more concrete)
How to learn?
When learning, study something by focusing on it, then take a break or change focus to something different for a while (for diffused mode to take place). Use the Pomodoro technique