This article explains in detail how to place location pins for Google Maps on a computer or mobile device.
How to place a pin on Google Maps
A Google Maps pin is a marker that identifies a location on a map. Creating a pin shows precise location data, including GPS coordinates. You can use pins to help find directions to off-street sites or to quickly identify businesses.
To place a pin on the Google Maps website, follow these steps:
Open Google Maps and browse to the location where you want to place the pin, or find the area using a search.