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Question:

Why 101on books?

Do anyone know why a book titles uses the number 101?
an example:

Attitud 101
Real Estate 101
Leadership 101 etc etc.


Best Answer - Chosen by Asker: It's a reference to college courses which begin at the 101 (freshman) level. It's the basics.

If you call a book like "Attitude 101" that means it's the basic knowledge you would need for attitude.