There's an adage in investing that you should only invest in what you know. Generally speaking, this is a good rule — if you do not understand a company product or have no experience with its industry, then investing in a specific company could be risky. Yet, there are times when it's necessary to get out of your comfort zone and try something new and adventurous. The challenge is determining how to do that.

We are financial advisors from Houston and San Francisco, and we frequently do just that — encourage our clients to explore investments out of their comfort zones.

In Houston, we understand energy. As of 2017, Texas accounted for 37 percent of the nation's crude oil production and 24 percent of its natural gas production. And as of January 2018, Texan oil refineries accounted for 31 percent of the nation's refining capacity — and that is just oil. In 2017, Texas lead the country in wind-generated electricity and generated a quarter of all wind power in the US. It is safe to say, we feel comfortable talking the language and investing in the energy industry. Whether it is machinery fabrication for upstream, construction of pipes for midstream, or refining downstream, some Texans are comfortable investing in these areas.

In San Francisco, we understand tech, whether it involves social media, silicon, or apps. We have five of the top 10 most prominent tech companies in the world. In 2018, the technology industry accounted for around 62 percent of all office leasing activity in San Francisco. The Bay Area also dominates venture capital investment, accounting for 45 percent of all capital investment in the U.S, in large part because of tech startups in the area.

Naturally, we see that some investors in our hometowns feel comfortable investing extensively in these two industries. Sometimes, these investments take the form of venture capital, other times they are individual stocks.

For Houstonians, allocating all of their investments to the energy industry carries too much risk should the energy industry falter. The same is true for San Francisco with venture capital and technology.

Therefore, we encourage investors to diversify their portfolios by placing funds in multiple vehicles and equities with the knowledge that different industries will react differently to market ups and downs. While there is never a guarantee of the outcome, diversification is one of many factors critical to long-term investment success.

For Houstonians and San Franciscans, there are other industries we understand in which we can invest. For example, Houston boasts the largest medical center in the world with roughly 361,000 people employed in the healthcare industry. While San Francisco employs roughly 277,500 in tourism. If you're looking to diversify your portfolio, look around to see the opportunities in which other people are investing. You may be surprised about what you learn, and ultimately how comfortable you can become investing in industries you may be unfamiliar.

We do not recommend ever investing in a product or industry that you have no understanding of at all. However, if you have excitement about an investment opportunity and feel there is potential for growth to your portfolio, your investment may prove fruitful in the future. Still, please seek out a financial advisor to help.

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Joseph Radzwill is senior vice president and financial adviser with the Wealth Management Division of Morgan Stanley in Houston. Victoria Bailey is a financial adviser with the Wealth Management Division of Morgan Stanley in San Francisco.