If you choose to use an online broker, then you will need to select a stockbroker that will give you access to the stock market. A stockbroker is a financial institution that connects stock sellers and buyers. Some of the most popular ones in the U.S. include Robinhood, Charles Schwab, Webull, Fidelity, Zacks Trade and eToro, among others.

The broker you pick first shapes how your money grows. My three favorites for new investors make opening an account fast and simple.

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Here's how to start investing in stocks from square one:

Unlike investing in stocks, investing in private companies can be quite challenging for retail investors. Buying stock in start-ups is generally reserved for venture capital firms or accredited investors. Cathie Wood's Ark Investor portfolio provides ...

Capital at risk. The value of your investments can go up and down, and you may get back less than you invest. Investing has the ability to offset this, because the aim is for your wealth to potentially keep pace with – or hopefully, outstrip – inflation.

Get step-by-step guidance on how to invest in Tesla stock and learn the ins and outs of this electric vehicle company.