guide3 min read

Beginner's Guide to Investing

Start investing with $100 or less. Index funds, compound interest, and the strategy that beats 90% of professionals.

Investing is the process of putting money into assets that have the potential to grow in value over time, allowing your wealth to compound beyond what saving alone can achieve. The simplest investing strategy that outperforms 90% of professional fund managers is passive index investing: regularly investing in a total stock market index fund and holding it for the long term. This is not a theoretical claim — decades of empirical data from the S&P SPIVA scorecard consistently show that 85-95% of actively managed funds underperform their benchmark index over 15-year periods, after accounting for fees. The recommended order for investing is designed to capture the maximum tax advantage at each step. First, contribute to your employer 401(k) up to the company match — this is an immediate 50-100% return on your money that no other investment can match. If your employer matches 50% of contributions up to 6% of your salary, you should contribute at least 6% before doing anything else. Second, open and max out a Roth IRA ($7,000 per year limit in 2026). Roth contributions are made with after-tax dollars, but all future growth and withdrawals in retirement are completely tax-free. For someone in their 20s or 30s, decades of tax-free compound growth makes the Roth IRA extraordinarily powerful. Third, return to your 401(k) and increase contributions up to the annual maximum ($23,500 in 2026). Fourth, if you can save beyond these tax-advantaged limits, open a taxable brokerage account. A simple three-fund portfolio provides all the diversification most investors need: a total US stock market index fund (VTI or VTSAX), a total international stock market index fund (VXUS or VTIAX), and a total bond market index fund (BND or VBTLX). A common allocation for someone with 20-30 years until retirement is 60% US stocks, 25% international stocks, and 15% bonds. As you approach retirement, gradually increase the bond allocation for stability. The total annual expense ratio for this portfolio is under 0.10%, compared to 0.50-1.50% for the average actively managed fund. On a $500,000 portfolio over 30 years, the difference between a 0.05% and a 1.00% expense ratio is approximately $240,000 in lost returns. The most important behavioral principle in investing is consistency through market downturns. The stock market drops 10% or more roughly once per year and 20% or more roughly once every 3-4 years. These declines are temporary — the market has recovered from every crash in history and gone on to new highs. Selling during a downturn locks in losses and eliminates your ability to participate in the recovery. Dollar-cost averaging — investing the same amount on the same schedule regardless of market conditions — naturally buys more shares when prices are low and fewer when prices are high, reducing the impact of market timing. Starting with $50 or $100 per month is perfectly fine. The mathematical power of compound interest means the most important factor is time in the market, not the size of your initial investment. $500 per month invested at an 8% average annual return grows to $745,000 in 25 years. Of that total, $595,000 is pure compound growth — money your money earned — and only $150,000 is the amount you actually contributed. Starting 5 years later with the same monthly amount yields only $440,000, a difference of $305,000 caused entirely by missing 5 years of compounding.