In one sentence, describe what the following article is about:

Your real estate investment can be active or passive. Active investment, such as trading properties or flipping houses, is more risky because property isn't particularly liquid. If you need to get rid of it, you may not be able to find a buyer. Passive investment is less risky, and may be a good place to start real estate investment. A popular option is to buy shares in a real estate investment trust (REIT). Each share represents a diverse bundle of properties, kind of like a mutual fund for real property. You can purchase shares through a broker. Forex, the international currency exchange market, is the largest financial market in the world. Currencies rise and fall in relation to each other, primarily based on the strength of each country's economy.  To successfully trade currency, you need a strong understanding of geopolitical trends and events. Be prepared to read a lot of international news every day so you can spot opportunities. It's usually smart to focus on one or two currencies so you can thoroughly research those countries' economies and keep up with the latest news. An option is a contract that gives you the right to buy or sell an asset at a certain price at a set point in the future. Since you don't have the obligation to buy or sell at that point, your potential losses are limited to the price you paid for the contract. To trade options, open a brokerage account, either online or with a traditional broker. The brokerage firm will set limits on your trading ability, based on your experience investing and the amount of money you have in your account. If you get into riskier investments, a solid hedging strategy will help protect your portfolio. The basic concept of hedging is to offset a possible loss in one security by simultaneously investing in another security that is likely to move in the opposite direction.  Most passive investors, who are simply investing for retirement or a long-term goal (such as money for their kids' college), have no use for hedging. However, if you're making aggressive or risky investment choices, hedging can provide a sort of insurance that lessens the impact of losses, particularly from short-term market fluctuations. A financial planner or advisor is essential if you start to move into more aggressive, shorter-term investment strategies. They will help design your hedging strategy and make sure the bulk of your portfolio is protected. Commodities can be used to hedge against risk, because they tend to behave differently than stock markets and currencies. However, they are risky because they respond to a variety of different factors, many of which are completely outside of human control.  There are hard commodities, including precious metals, and soft commodities, such as wheat, sugar, or coffee. You can invest in commodities in 3 different ways: physically buying the commodity itself, buying shares in a commodity company, or buying futures contracts. You can also invest in commodities more passively through investment funds. Exchange-traded funds (ETFs) may have shares in commodity companies, or may track a commodity index.

Summary:
Dive into real estate for longer-term investing. Move into the currency market if you like a challenge. Trade options to limit your exposure. Practice hedging to lower your risk. Diversify your portfolio with commodities.