When trying to learn something new, it is optimal to make the difficulty of what you're trying to learn such that you're getting things right about 85% of the time and making errors about 15% of the time. This rule suggests that setting goals that are just challenging enough to result in a 15% error rate is ideal for effective learning. It is important to note that this rule applies to various domains such as sports, language, and math. It is not necessary to achieve an exact 15% error rate, but rather to aim for a level of difficulty that encourages growth without overwhelming the learner. This insight can be valuable for individuals trying to learn something and can also guide teachers in setting appropriate learning goals for their students.

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