• The Nasdaq Composite hit a new record high.
• Nvidia, meanwhile, fell into correction territory.
• Walmart is giving some of its employees body cameras.

Here are five key things investors need to know to start the trading day:

1. Tech drives

It was all tech on Wall Street on Monday. The Nasdaq Composite rose 1.24%, led by technology stocks including Apple, Google-parent Alphabet, electric car maker Tesla and AI-chipmaker Broadcom, while the tech and consumer discretionary sectors of the S&P 500 also closed at records. The S&P 500 gained 0.38%, but the 30-stock Dow Jones Industrial Average sank 0.25%. It was the eighth day of losses for the Dow, marking its longest run of losses since 2018. Follow live market updates.

2. Fall from grace?

What goes up must come down. While the Nasdaq Composite hit another record, Nvidia fell into correction territory Monday, ending the day about 11% off its closing high of $148.88 reached last month. The chipmaker, which has become a favorite AI-related trade, is still up 166% this year. Shares were down again in premarket trading. Fellow chipmaker Broadcom, meanwhile, hit a new high Monday, gaining about 11% and hitting a market cap above $1 trillion on increased price targets from Wall Street. Keith Lerner, co-chief investment officer at Truist, said the market is realizing there are other AI beneficiaries besides Nvidia.

3. Walmart's watching

Walmart is giving some of its store employees body cameras, CNBC's Gabrielle Fonrouge reported. It's unclear how many locations are using the recording devices, but some stores have signs in front of entrances alerting customers that they have "body-worn cameras in-use." The nation's largest non-government employer appears to be using the technology to deescalate tense situations with customers, according to training materials provided to employees. Read more about the body camera effort here.

4. Fed ahead

The Fed is likely to cut rates, but some worry that might not be the right move, according to the CNBC Fed Survey for December. Ninety-three percent of respondents said they see a quarter-point cut coming, but only 63% believe it's what the Federal Reserve should do. Those surveyed also expect there will be just two more quarter-point cuts, down from three in the last survey. That forecast would bring the funds rate down to 3.8% by December 2025 and 3.4%, or just above the average neutral rate, by the end of 2026. Read more about expectations for inflation and unemployment here.

5. Tick tock

TikTok has asked the Supreme Court to block a law that could effectively ban the popular social media app. The company wants the high court to hear its appeal before letting the law take effect on Jan. 19. The legislation would require TikTok's Chinese owner ByteDance to sell the app by that date, or force Google and Apple to stop supporting it on their platforms in the U.S. Meanwhile, President-elect Donald Trump told reporters Monday that he would "take a look at TikTok" when asked about the potential ban, noting he has a warm spot in my heart for TikTok."

— CNBC's Brian Evans, Samantha Subin, Ari Levy, Gabrielle Fonrouge, Steve Liesman and Dan Mangan contributed to this report.