In fact, if you want to learn something and it's possible to do by the self, doing by self from my experiment is best option because you naturally can do free exploration on sites like YouTube or Wikipedia. Plus you can talk to AI to simulate a useful tutor, or guider, e.t.c.
It should be more efficient. If you even have the slightest bit of learning drive. For teachers, you have to wait for class; by yourself in free exploration, you can wait to suit your needs. Plus, no ruined sleep, or working when demotivated.