Questions about HP 255 G10

No

The USB-C port on this notebook does not support image output as it is only designed for data transfer. To connect a monitor, you can use the HDMI port or use a USB adapter with DisplayLink technology, which enables video output via USB.

The keyboard for the "255 G10" model from HP Inc. is not specifically mentioned as being backlit in the information available. To check if your notebook is equipped with a backlit keyboard, you can look for a mini keyboard icon on your keyboard, usually in the row of function keys, or consult the product specifications on the HP support site.

Sorry, I didn't buy the article for myself...

No, there is no LAN connection