A cash bank deposit is the simplest, most easily understandable investment asset—and the safest. Not only does it give investors precise knowledge of the interest they'll earn, but it also guarantees they'll get their capital back.

A bond is a debt instrument representing a loan made by an investor to a borrower. A typical bond will involve either a corporation or a government agency, where the borrower will issue a fixed interest rate to the lender in exchange for using their capital. Bonds are commonplace in organizations that use them in order to finance operations, purchases, or other projects. Bond rates are essentially determined by the interest rates. Due to this, they are heavily traded during periods of quantitative easing or when the Federal Reserve—or other central banks—raise interest rates.

Funds are pooled instruments managed by investment managers that enable investors to invest in stocks, bonds, preferred shares, commodities, etc. The two most common types of funds are mutual funds and exchange-traded funds or ETFs. Mutual funds do not trade on an exchange and are valued at the end of the trading day; ETFs trade on stock exchanges and, like stocks, are valued constantly throughout the trading day. Mutual funds and ETFs can either passively track indices, such as the S&P 500 or the Dow Jones Industrial Average, or can be actively managed by fund managers.

Trusts are another type of pooled investment, with Real Estate Investment Trusts (REITs) the most popular in this category. REITs invest in commercial or residential properties and pay regular distributions to their investors from the rental income received from these properties. REITs trade on stock exchanges and thus offer their investors the advantage of instant liquidity.

Commodities include metals, oil, grain, and animal products, as well as financial instruments and currencies. They can either be traded through commodity futures—which are agreements to buy or sell a specific quantity of a commodity at a specified price on a particular future date—or ETFs. Commodities can be used for hedging risk or for speculative purposes.