Markets are constantly changing, and investors constantly get fed an endless stream of trendy investing strategies and predictions. Yet, some of the most effective investing lessons have remained unchanged for decades. Let’s look at these five timeless principles that have been tried and tested by countless investors and have helped them make better decisions in any environment.

Principle #1: Invest in Great Businesses, Not Just Stocks

You become a partial owner when you buy a company’s stock. Your long-term returns are tied to how well that company performs. Strong companies are generally more resilient during economic downturns, and can grow stronger and more valuable over long periods. They typically have:

• Strong balance sheets
• Competitive advantages
• Consistent profitability
• Capable management teams

Southeast Asia’s biggest bank, DBS Group (SGX: D05), for example, saw its 1Q2026 net profit up 1% year-on-year (YoY) to S$2.93 billion as total income reached a new high. Instead of reacting to short-term price changes, an owner’s mindset focuses...