No. The Lenovo IdeaPad S145-15 laptop model number 81MV0001US does not ship with a ethernet port. You can connect this device to an ethernet cable by using a USB to ethernet adapter with this device.

That will depend on the requirements and compatibility of the specific game. We recommend you check with the specific game's software publisher's web site for their compatibility with Windows 10 S-Mode 64-bit 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.) 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

No. The Yoga 730-13 does not have a CD/DVD drive built in. You can use an external, USB-based CD/DVD drive with this device.

Yes. The Lenovo IdeaPad S145-15 laptop ships with Windows 10 S-Mode 64-bit 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. To install Google Docs, you will need to switch to Windows 10 Home. Here is a link to instructions for switching from Windows 10 S-Mode to Windows 10 Home: https://support.microsoft.com/en-us/help/4456067/windows-10-switch-out-of-s-mode