hey google credits are basically the online currency that you can use to buy stuff in games online while in the google play store. They are kinda on the roll now. everyone is using them. there are a few options for you to find them. You can A) buy them for cash or B) earn them online for free. I personally prefer the second option. There are a lot of ways that you can do it but I used this article:
https://yourmoneygeek.com/free-google-play-credit/ as a starting ground to build up a substantial amount.
