How do I add an on/off button to a Raspberry Pi Zero board? I am new to the platform and kindly ask for instructions suitable for a novice. Thank you.
The only caveat with your RPi model is the soldering. Here is a video from the Raspberry Pi Foundation on how to solder pins to your RPi Zero. And here is another guide on how to add 40-pin GPIO connector.
Adding an on/off is fairly simple IF you can solder pretty good. However, depending on where the Pi is located, you could get on of the usb cables that come with a on/off switch. They are fairly cheap and come in various links. I have a couple that I use EVEN though I poweroff the pi.