Invest in what you understand well

SMU business undergraduate Amos Soo’s favourite quote from successful investor Peter Lynch is: "Never invest in any idea you can't illustrate with a crayon." As Soo understands it, one knows a company well when one can explain it to a kid. As a member of the Citi-SMU Financial Literacy Club, he gets to explain firms and concepts to younger students regularly.

Source
The Sunday Times