The best way to learn is one-on-one (given that the teacher/mentor knows what he is doing). We all have different processes and need different data to helps us

The best way to learn is one-on-one (given that the teacher/mentor knows what he is doing). We all have different processes and need different data to helps us get the big picture or tackle some problems more efficiently (eg: learning an instrument). Unfortunately this approach is way too expensive and doesn't scale which is why we have all sorts of tech to distribute knowledge (books, classes, lectures, blogs, videos, etc). I imagine 100 years from now we will have AI teachers that can reproduce the one-on-one experience.