CEO and Founder of Simply Finance Mariel Bitanga shares the best money lesson she learned after five years of working in the financial industry.  IMAGE Pexels 

While your 30s can be an exciting decade of your life, you're also faced with bigger financial responsibilities. Are you planning to buy your first home or your first car? 

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If you want to make your money grow, one way to achieve this is to "spend less than you earn, and [then] invest the difference." This is the most important money lesson that Mariel Bitanga, the 29-year-old CEO and founder of financial planning firm Simply Finance, learned after five years of working in the financial industry. The expert talks more about this money habit in the exclusive video below: