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> The problem with self-teaching is that you don't know what you don't know, so you don't realise where the gaps in your knowledge are.

The benefit of self-teaching is that you do not have to try and learn everything in four straight years and then set forth into the world with what you were able to take in during that time. In practice, the gaps become quite apparent when the gaps become problematic and one can quickly fill in the gaps on the fly thanks to no dependence on the schedule of others to fill those gaps.