Help Requested - How to Install Play Store on a China Samsung C9 Pro?

[AC Question]

I have found similar questions from various posters here, but I have not found any
clear, detailed replies. I have learned that something called "GApps" is the solution but I have no idea how to install/run it. If someone could provide easy-to-follow step-by-step instructions for downloading/installing GApps in order to have access to Google Play Store, etc. on my China-bought Samsung C9 Pro (or any other China bought Android phone), I will be very grateful. Cheers, George A