What you paid for an investment. Holding on to a losing investment until you break even can burn you badly. Some stocks never come back. Buy and hold can work out well for some stocks, but for others, you're just throwing good money after bad.

The time and effort yo...

In school, your teachers worked out a lesson plan and made sure you were aiming in the right direction. When you're teaching yourself, you have to do it yourself.

• Deconstruct and select: Every skill can be broken down into pieces. Find out what are the minimal learna...

Decide whether what you're trying to improve is mostly a habit or mostly a skill: if your main problem is with doing something you already know how to do, but doing it consistently, that’s probably a habit. If your main problem is not knowing how to do something well enough, that’s probably a ski...