Diversify. Diversifying your portfolio is one of the most important things that you can do, because it diminishes your risk. Think of it this way: If you were to invest $5 in each of 20 different companies, all of the companies would have to go out of business before you would lose all your money. If you invested the same $100 in just one company, only that company would have to fail for all your money to disappear. Thus, diversified investments "hedge" against each other and keep you from losing lots of money because of the poor performance of a few companies.
Different industries tend to perform differently under different economic conditions or expectations. These relationships are not perfect, but they do provide reliable indications. For example, financial institutions are sensitive to interest-rate changes, and food and health care companies are typically more resistant to economic downturns than, say, factory equipment manufacturers.
Since Betterment launched, other robo-first companies have been founded, and established online brokers like Charles Schwab have added robo-like advisory services. If you want an algorithm to make investment decisions for you, including tax-loss harvesting and rebalancing, a roboadvisor may be for you. And as the success of index investing has shown, if your goal is long-term wealth building, you might do better with a roboadvisor.
You will want to build a solid foundation for your investments. This includes having a large base of stocks. One of the easiest places to start if you only have enough for one investment is to purchase a mutual fund or ETF in the S&P500. This provides access to the largest 500 companies in the United States. Then, you can branch out into other investments such as the Total US Stock Market Index and the Total International Stock Market Index. However, diversification is not only within stocks but also though different asset classes such as Bonds and international stocks/bonds. Always, consult a professional to create an investment portfolio tailored to your needs.
Something that might be confusing for new investors is that real estate can also be traded like a stock. Usually, this happens through a corporation that qualifies as a real estate investment trust, or REIT. For example, you can invest in hotel REITs and collect your share of the revenue from guests checking into the hotels and resorts that make up the company's portfolio. There are many different kinds of REITs; apartment complex REITs, office building REITs, storage unit REITs, REITs that specialize in senior housing, and even parking garage REITs. The World's Worst Stock Investment Advice