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While those of us who’ve been investing for a while may find this week’s reader question a bit obvious, it’s one of the more popular questions we get. It’s about how to go about getting started with investing.

Where or whom do I talk to to open an S&P passive no-load index fund? Do I go to a bank or brokerage house or to the fund directly? I don’t have much money to start with but I need to start.
Thanks in advance. — Stephen

Before we get to Stephen’s question, here’s a quick video I shot at the New York Stock Exchange about things beginning investors should know.

Now let’s answer Stephen’s question.

What’s a mutual fund?

In case you’re not familiar with a mutual fund, let’s start by understanding exactly what that means.

A mutual fund is simply a bunch of investors who pool their money and hand it over to a manager. That professional, in exchange for a management fee, oversees a diversified basket of investments and takes care of the paperwork.

Most mutual funds fall into one of three categories: a stock fund, a bond fund or a fund that holds both stocks and bonds, called a balanced fund.

The chief advantage of a mutual fund is that it allows an investor to own a small slice of a big portfolio. Diversifying with a bunch of stocks or bonds is much safer than putting all your money into one or two stocks or bonds.

While mutual funds are most commonly made up of stocks, bonds or a mix of the two, there’s a huge variety within those broad categories. You can find stock and bond funds that are extremely low risk, super-high risk and everything in between.

The mutual fund that Stephen is asking about is a fund that tracks the S&P 500: a stock index made up of 500 of the largest and most iconic American companies. It’s a popular option because it’s essentially an investment in the American economy. If you think the American economy will be bigger years from now than it is today — a pretty good bet — it’s a solid long-term investment.

Where can I open a mutual fund account?

Answer: theoretically, almost anyplace that handles money or investments.

Many bank branches now have a resident investment adviser, and many credit unions do as well. Brokerage firms offer all manner of investments, including mutual funds. Online investment firms also make it easy, and you can often go directly to many mutual funds as well.

That being said, Stephen is aware of a potential problem with going to some of these purveyors of financial products — commissions. He asks where he can buy “no-load” funds, which translates to “no commissions.” This is important: You obviously don’t want to lose a chunk of your investment up front to commissions.

Practically all brokerage firms and many other institutions that offer in-person investment advice make money through commissions, so they won’t offer no-load funds. And that radically reduces the choices.

For Stephen, and for you, the best place to buy no-load mutual funds is directly from the fund, or through online discount brokerage firms.

How do you do it?

Opening an online account with a no-load fund is not much different from opening a bank account.

I personally use Vanguard for my investments, including mutual funds, so I’ll use them as an example.

When you go to Vanguard’s home page, at the very top of the page you’ll see “Open an Account.” Click that, follow the prompts, and you’ll be in business.

According to Vanguard, it takes about 10 minutes to provide the information, which will include the type of account (IRA, individual, joint, etc.), your Social Security number, date of birth, email address, physical address, and employer name and address.

The next step will be to pick the investment you want. In Stephen’s case, he’ll select the Vanguard 500 Index Fund Investor Shares. That’s an example of the “S&P passive no-load index fund” he’s talking about. I’ve mentioned it many times, including in stories like “Here’s All You Need to Know About the Value of Wall Street Advice.”

Step 3 will be to fund the account. You can either send them a check, or set up a direct transfer from an existing checking or savings account.

That’s all there is to it. Other online firms may be slightly different from Vanguard, but the basics will be similar.