This is good teaching. You can get a concept across in a few minutes, or you can make someone struggle for hours to understand. I think classic academic teachin

This is good teaching. You can get a concept across in a few minutes, or you can make someone struggle for hours to understand. I think classic academic teaching, leans towards the latter (imagine a latex pdf that introduces an alphabet of Greek letters), vs. this, which learns you the concept pretty quick. You can them do the Greeks letters version later.