Index funds, asset allocation, and long-term wealth building.
Over 20-year periods, approximately 90% of actively managed funds underperform their benchmark index after fees. Index funds capture market returns at minimal cost. This is one of the most robust findings in financial research, replicated across markets and time periods.
Asset allocation — how you split investments between stocks, bonds, and other assets — drives the majority of long-term returns and volatility. Your allocation should match your time horizon and genuine risk tolerance. A portfolio you'll abandon during a crash is worse than a conservative one you'll hold through it.
The research is unambiguous: consistent long-term investing outperforms attempts to time market entries and exits for almost all investors. The cost of missing the ten best days in a given decade dramatically reduces returns. Invest regularly, rebalance occasionally, and resist the urge to react to news.