How to Invest in Stocks

A brokerage account is the account you use to buy and sell investments. Opening one is free and takes a few minutes online. Common US brokers include Fidelity, Charles Schwab, Robinhood, and Public, and most now offer commission-free stock and ETF trades, no account minimum, and fractional shares, so you can start with a small amount. You will link a bank account, transfer some cash, and then place orders.

• Taxable vs retirement. A standard taxable brokerage account is flexible and has no contribution limits. A retirement account like a Roth or traditional IRA offers tax advantages but has rules on contributions and withdrawals. Many people use both.
• What to look for. Commission-free trades, fractional shares, a usable app or site, and good research tools. If you also want to talk through decisions, see the best beginner investing apps.

Only fund the account with money you will not need for several years. Because stock prices move up and down, money you might need soon does not belong in the market. If you are still deciding whether to invest at all, start with how to start investing.

The biggest early choice is whether to buy shares of individual companies or a fund that holds many companies at once. There is no single right answer, and plenty of people do both.

An index fund or ETF holds hundreds of companies and tracks a market, so one purchase gives you broad diversification for a tiny annual fee. A fund like VOO tracks the S&P 500, and VTI holds nearly the entire US market. Individual stocks let you back specific companies you believe in, with the chance to beat the market and the risk that one company underperforms or fails. A common beginner path is a broad fund as the core with a small sleeve of individual names once you are comfortable. To go deeper on the fund route, read how to invest in index funds.

Diversification means spreading your money across many holdings so that any one going wrong does not wreck your portfolio. It is the closest thing investing has to a free lunch: it lowers risk without necessarily lowering your expected return. A single index fund is diversified by design; a handful of individual stocks in the same industry is not.

• Across companies. Owning many businesses means one bad result is a dent, not a disaster.
• Across sectors. Technology, healthcare, energy, and financials move differently, so mixing them smooths the ride.
• Beyond stocks. Some investors add bonds for stability. If you are weighing that, see stocks vs bonds.

A frequently cited rule of thumb is to keep any single stock to a modest share of your portfolio, but the right number depends on you. For a step-by-step approach, read how to build a diversified portfolio.

If you do buy individual stocks, research before you buy. You do not need a finance degree, but you should understand what you own and why. A workable process:

• Understand the business. How does the company make money, who are its customers and competitors, and what could disrupt it?
• Look at the numbers. Revenue growth, profitability, debt, and valuation (how the price compares to earnings). You do not need every metric, just a fair picture of health and price.
• Weigh both sides. Write down the bull case and the bear case. What would have to be true for this to work, and what could go wrong?
• Read recent context. The latest earnings report and news tell you how the story is actually unfolding.

AI tools can speed this up by summarizing filings, explaining a metric in plain language, or comparing a company against its peers, though you should verify anything important against primary sources and make the decision yourself. For a full walkthrough, see how to research a stock with AI.

Rather than trying to guess the perfect moment to buy, many investors put a fixed amount in on a regular schedule, for example a set sum every month. This is dollar-cost averaging. When prices are low your fixed amount buys more shares, and when prices are high it buys fewer, so you avoid the trap of pouring everything in at a peak.

• It removes timing pressure. You do not have to predict the market, which no one does reliably.
• It is easy to automate. Most brokers let you set up recurring buys into a stock or fund, so the habit runs itself.
• It builds discipline. Investing steadily through good and bad markets is what compounds over time.

Dollar-cost averaging does not guarantee a profit and does not protect against loss in a falling market, but it reduces timing risk and makes consistent investing far easier to stick with.

The stock market rewards patience more than cleverness. Short-term prices are noisy and unpredictable, but a broadly diversified portfolio has historically trended upward over long horizons. That is why buy-and-hold, reinvesting dividends, and ignoring day-to-day swings is such a common approach. The most reliable ways beginners hurt themselves are behavioral, not technical:

• Over-concentrating. Putting too much into one stock turns a single bad outcome into a large loss.
• Overtrading. Frequent buying and selling racks up costs and taxes and usually leads to worse timing.
• Chasing hype. Buying whatever recently soared often means buying high.
• Panic-selling. Selling in a downturn locks in losses and misses the recovery.
• Ignoring fees. High fund fees and trading costs compound against you the same way returns compound for you.

The antidotes are boring on purpose: diversify, contribute regularly, keep fees low, and hold through volatility. Keep a written reason for each holding and a plan for when you would sell, so decisions stay deliberate. None of this guarantees a return, and it is educational rather than a recommendation.

Walnut does not tell you what to buy or manage your money. It is an AI investing assistant that connects the broker you already use (through a read-only connection by default), lets you chat through Claude, ChatGPT, or built-in AI to research and compare companies and funds, and lets you build a basket around a thesis and see how it would have tracked against a benchmark like the S&P 500, so any bet has to earn its keep. When you decide, you place the trades you approve yourself. That makes it a fit for a self-directed beginner who wants help thinking, not someone to hand the decisions to. If you want to understand that model, read self-directed investing. Walnut is a tool for investors, not an adviser.