The Nvidia GeForce GTX1660 GPU within the Lenovo Legion Gaming Desktop, model number 90NUZ58AUS, ships with: 1x DVI, 1x DP, 1x HDMI

That will depend on the requirements and compatibility of the hardware you want to use with the computer. The Lenovo IdeaPad 3 15 Laptop, model number 81WE00KVUS, ships with Windows 10 S-Mode Operating System. Windows 10 S-Mode provides added security by only allowing APPs available ( and therefore certified by Microsoft) at the Microsoft Store. If you don't need the added security or you need to install APPs not available at the Microsoft Store, you can switch to standard Windows 10 Home 64-bit Operating System, at no additional cost. We recommend you check with the game's software publisher's web site for their compatibility with Windows 10 S-Mode 64-bit operating system and the minimum/recommended hardware requirements (Is a Graphics card required, the processor speed and the minimum required system RAM and the minimum available hard drive space) to run their program, then compare those requirements to this system's configuration.

There is a manual Privacy Shutter slider directly above the webcam lens. Slide the tab to the left to close the Privacy Shutter. A red dot will appear over the webcam lens when the Privacy Shutter is properly set. To open just slide the tab to the right to open the webcam. The red dot over the webcam lens will disappear when the Privacy Shutter is properly opened.

Yes it can connect to a standard USB to ethernet adapter.