Kevin O'Leary shares five essential rules for successful investing. He emphasizes diversification, limiting any single stock to five percent. Investors should spend only generated income, never touching their principal. O'Leary advises buying only investments that consistently pay dividends. He also stresses controlling debt and maintaining investment liquidity.

The Shark Tank star's advice is simple—but does the math actually hold up?

Kevin O'Leary shares five essential rules for successful investing. He emphasizes diversification, limiting any single stock to five percent. Investors should spend only…