Is this monitor good for gaming?

Only casually. The 60Hz refresh rate and 4ms response are fine for strategy and office games, but fast shooters will feel the difference against 144Hz panels.

Can I connect a laptop with one cable?

Yes. USB-C carries video and data, and the monitor also has Ethernet and Wi-Fi, so a laptop can dock through it. Check that your laptop's USB-C port supports DisplayPort video.

Is 384 nits bright enough?

For indoor office and home use, yes. It is not bright enough to fight strong window glare, and HDR content will look flat compared with a mini-LED or OLED display.

Does it have built-in speakers?

The listed specs do not confirm speakers. Plan on external speakers or headphones unless the retailer's full spec sheet says otherwise.

Is 4K worth it at 27 inches?

If you read a lot of text or edit photos, yes. The roughly 163 ppi density makes text noticeably crisper than a 1080p or 1440p panel at the same size.