dad no. 1 trading rule

study the company fundamentals background , learn to foresee the prospect of company direction and product position in the market, learn to read charts, listen to people and read the analysis given by professional but do not follow blindly to chase after share prices.
Anyhow, the final decision to buy or sell is within your mind and heart.. ha ha ha.. sometimes with your sentiment and gut feelings, "most importantly" with your mum's "advices " or otherwise invest with your extra money with due diligent without letting your mum knows..