Yes it does.

That will depend on the requirements and compatibility of the device you want to use with this computer. We recommend you check the requirements and compatibility of the device you want to use with this laptop, for its requirements and compatibility.

The power plug is on the far left of the back of the monitor. It is on the other side of the monitor from the 3.5 mm audio jack. Here is a link to the User Guide which has diagrams of the location of the ports and power plug port on this monitor: https://download.lenovo.com/consumer/monitor/lenovo_g25_10_ug_201910_en.pdf

Yes it does. There is a 300p webcam and microphone built in. The IdeaPad 1 14 Laptop, model number 81VS0001US ships with Windows 10 S-Mode Operating System. Whether this model is compatible with a specific APP will depend on that APPs requirements and compatibility. We recommend you check with the specific APPs 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.