Since Android 5.1 has limited system partition space, choosing a smaller package is usually safer:
(Smallest)
Here are the most common variants (from full to minimal): gapps android 51
: The bare minimum. Includes Google Play Store, Play Services, and core sync features. Since Android 5
| Source | Link/Notes | | :--- | :--- | | | SourceForge: open-gapps-arm-5.1-nano-20191210.zip (last official) | | MindTheGApps | AndroidFileHost: Search "MindTheGApps-5.1.0" | | Legacy ROM forums | XDA Developers threads for your specific device | gapps android 51
You are asking to create a feature list (release notes or description) for a GApps (Google Apps) package intended for Android 5.1 (Lollipop) .