Investing For beginners
Portfolio and Risk: Building Something You Can Hold Through a Bad Year
Which stocks you pick matters less than how you combine them, how often you rebalance, and how much of the return you hand to fees and taxes. These guides cover the decisions that compound over decades.
How you combine your holdings matters more than which ones you pick. This section covers asset allocation, what diversification does and does not remove, when and how to rebalance, whether to invest a lump sum or spread it out, how to measure the risk you are already carrying, and how much of your return goes to taxes. These are the decisions that compound quietly over decades while everything louder cancels out.
It is written for beginners, and it is useful to anyone who has accumulated accounts without a plan connecting them. If you hold a workplace plan, an IRA and a brokerage account and have never looked at the three as one portfolio, the allocation and tax guides will change what you do next. No guide here asks you to pick a stock, and most of the work is arithmetic plus one decision a year.
The pillar comes first and sets the stock, bond and cash split against your risk capacity and your time horizon. Diversification then explains why thirty stocks in one sector is still a single bet. Rebalancing turns the allocation into a rule you can follow cheaply. Dollar-cost averaging against lump sum answers the question people ask when they suddenly have cash to deploy. Risk measurement, taxes and the retirement guide close the section with volatility, beta, Sharpe, drawdown, account location and withdrawal rates.
This section sits on top of the others. It buys the funds the ETF section explains, uses the bonds from the fixed income section as ballast, and sets the position size that limits what any single stock idea can do to you. The correlation tool shows what your holdings really have in common, and the Sharpe and drawdown calculators put numbers on the risk you are running right now.
Asset Allocation: The Decision That Drives Most of Your Returns
Before you choose a single fund, you choose how much of your money sits in stocks and how much sits in bonds and cash. Here is how to make that decision on purpose.
Read the guide →Start with the basics
- beginner
Diversification Explained: Why 30 Stocks Can Still Be One Bet
Owning thirty names feels diversified. If they rise and fall together, you own one position in thirty pieces. Correlation is the number that tells you which you have.
- beginner
Portfolio Rebalancing: When, How Often and How to Do It Cheaply
A strong year for stocks quietly turns a 60/40 portfolio into a 68/32 one. Here is the arithmetic, the two trades that fix it, and how to avoid paying tax you never needed to pay.
- beginner
Dollar-Cost Averaging vs Lump Sum: What the Evidence Says
A $500 monthly contribution through a falling and recovering market, with the average cost worked out in full, and an honest look at which approach the evidence favours.
- beginner
Retirement Portfolio Basics: 401(k)s, IRAs and the 4% Rule
Which account to fill first, what the match is really worth, how a target-date fund changes as you age, and an honest reading of the 4 percent rule.
- beginner
401(k) Explained: Match, Vesting, Fees and Rollovers
Four things inside a workplace plan decide most of your result: the match you claim, the vesting clock, the fee on the fund menu, and what you do with the money on your last day.
- beginner
Emergency Funds: How Much, and Where to Keep It
The right number comes out of your bills, and it is personal. Here is how to work it out, what the cash costs you in expected return, and where the money can sensibly sit.
Go deeper
- intermediate
Measuring Portfolio Risk: Volatility, Beta, Sharpe and Drawdown
Four numbers describe how risky a portfolio is, and they disagree with each other. Here is how each one is calculated, and which one actually predicts whether you will sell.
- intermediate
Tax-Efficient Investing: Account Location and Tax-Loss Harvesting
The same $10,000 gain can cost you very different amounts depending on the calendar. Here is how holding periods, account choice and fund structure change what you keep.
Portfolio & Risk: common questions
What is a good asset allocation for my age?
Age-based rules such as 110 minus your age in stocks are starting points. What matters more is how large a decline you can hold through without selling, and the date you will need to spend the money.
How often should I rebalance my portfolio?
Once a year, or when an asset class drifts more than about 5 percentage points from its target. Rebalancing more often adds costs and taxes without improving results in most published studies.
Is dollar-cost averaging better than investing a lump sum?
Lump sum wins more often, because markets rise more often than they fall. Averaging in reduces regret and the chance of a bad entry, which matters a great deal if it is what keeps you invested.
How many stocks or funds do I need to be diversified?
Two or three broad funds cover most of it. With individual stocks, most company-specific risk falls away by 20 to 30 names spread across sectors, and the market risk that remains cannot be diversified away.
What is a Sharpe ratio?
Return above the risk-free rate divided by volatility. It tells you how much return you earned per unit of risk taken. Higher is better, and comparisons only mean something between similar strategies over the same period.