What are the three areas, Financial managers must have a knowledge of to do their jobs well?

*Money and Capital Markets 

*Investment .

  The three main function in the investments area are :

  1. Sales 

  2. The analysis of individual securities and

  3. determining the optimal mix of securities for a given investor.

*Managerial Finance

is important in all types of businesses , including banks and other financial institutions ,as well as industrial and retail firms .

Weston , Brigham  Tenth Edition , Essentials of Managerial Finance.