is not a custom ROM. It means “Google Applications” and usually includes Google play service, Play Store, Gmail, Google IME, and more. If you have some of these applications, then you already have some GAPPS. Most users will only need to install GAPPS if they have installed a custom ROM that did not have GAPPS included.
Google Gapps For Any Android ARM 64 (64 bit) [Aroma/Stock/Full/Mini/Micro/Nano/Pico] .zip Release : 2017 @github Install via Recovery mode Size : Variants DOWNLOAD