@inthehands @kellogh @jmeowmeow I would add that the focus of the education that has lasted was learning "skills*, acquired only through practice. For example, the skill of close and careful reading (and listening), the skill of logical argument, the skill of writing (both handwriting and stringing words together to communicate clearly ideas, methods, and questions), and so on.
Skills stay with us if we continue to use them, and we do use essential skills. And they do require practicing them.