You've got to admire Google's honesty. Right now, the company's own safe browsing tool is flagging "google.com" as partially dangerous. Does that mean your computer is doomed if you need to Google search for "funny cat videos"? Likely no, Google — like lots of websites — is just unsafe when in the wrong hands. Here are the specific reasons why Google.com is partially dangerous:
Google's diagnosis essentially explains that Google.com can be a platform for people trying to scam you, whether forcing you to download malicious software or redirecting to unsafe sites. As one Redditor pointed out, Bing.com is fine. (But then you'd have to use Bing.com, which is bad in its own way.)
Really this Google update is just another reminder that web browsing is never 100 per cent safe, even if a site is owned by one of the largest technology companies to ever exist. Practice safe surfing, and to echo Google's own Douglas Adams-inspired advice: Don't Panic.