LEARNING TO LEARN

Talking about learning to learn, some experts say that that's exactly the area where THE LEARNER and no one else knows what helps him to memorize (etc) better. But what if not? Why do learners take part in trainings or even courses "Learning how to learn"? As a lecturer I know that some students are simply helpless and hopeless while trying to learn something because nobody taught them HOW. Some of them memorize information for a short period of time, but what's the sense of it? I believe, that some learning strategies SHOULD be taught at school explicitly. Young learners and even small children should be given a variety of learning strategies so that they can choose what is  better for them according to their psychological and physiological characteristics.