The stock market saw more growth in 2017 than it has in four years.
The Nasdaq, comprised largely of technology stocks, grew more than 28 percent. The 30 blue-chip stocks making up the DOW grew more than 25 percent, and the Standard & Poor's 500 grew nearly 20 percent.
"There's been a lot of optimism with the new administration in this country, the job market is healthy, the Fed has kept interest rates low, so people are just optimistic about where the economy is headed," certified financial planner Kristine Davenport said.
Davenport said that despite record growth in U.S. stocks, it's important to stick to fundamentals of investing.
"It's easy to say in a year like this, 'oh my gosh, I wish I was up 20 percent,'" Davenport said. "But you also have to keep in mind that those stocks that are up the most also have the most likelihood to drop the most."
Republican tax reform, and anticipation for the bill, is also credited with some of the optimism, but as the market grows to new highs, many investors are weary that it will turn back down.
"I think it's safe to be cautiously optimistic," Davenport said. "A lot of investors are concerned that there will be market correction in the future, and I can say with absolute certainty that there will be a market correction at some time in the future, whether or not it's 2018, there's really no way to tell for sure."