macOS now adds special permissions to standard folders including your Home folder, and its special folders inside it. This explains those ACLs and how to fix them.
TinkerTool System
How property list files store your preference settings, and how to access additional features.
Using TinkerTool System or MacPilot to make easier use of the Shared folder using ACLs.
You can use ACLs to ensure that all files created in a shared folder inherit the permissions of their parent folder.
The Eclectic Light Company 