Step 1: Stop switching topics. You're not learning if you're constantly switching focus. Step 2: Depends entirely on the nature of what you're trying to learn.

Step 1: Stop switching topics. You're not learning if you're constantly switching focus. Step 2: Depends entirely on the nature of what you're trying to learn. Spaced repetition is the canonical approach, which lends itself to some forms of knowledge far better than others. E.g., "learning philosophy" isn't suitable for SR.