Argentinan tango is my the most relevant personal example which proves that the more I know, the more I know that I know nothing.

Of course, when I was a total beginner, I knew that I know nothing. But after about 10 months, when I have "learned" a solid number of moves and when girls from my (little) school started to like dancing with me, I was feeling pretty self-confident about my "advanced" dancing skills.

That self-confidence made me go to a milonga (tango social dancing night) where I tried dancing with many girls from different schools, with some of the girls being much more advanced than my partners. That night, I found out one interesting fact - I couldn't lead almost anything and the girls didn't like dancing with me.

That made me realize that the girls from my school managed to follow me and liked dancing with me only because we have learned the same combinations of moves in a certain order and they knew me very well, so they could recognize what I want them to do even if I didn't lead very well (or well at all).

There were a couple of additional enlightenments about the level of my tango knowledge/ignorance later, but I don't want to make this comment too long - I might actually a whole musarticle about this.

Cheers! : )