Description
Lets you get a Serpens Property you created.
You can switch between Addon properties (created in the N-Panel) and Node (created on nodes like Operator or Preferences).
The From Property Group checkbox lets you select a property that you created inside a property group.
Inputs
Data: The data that your property is attached to. Things like Scenes and Objects use the active one by default, for others, you will have to connect blend data to this input
Outputs
Property (first output): This output will return the actual property. You can use this to connect to something like a display property node
Value: This output will return the current value of the property.
While you can usually also plug the property output into something like a string input to get the value, you should make a habit of using the value output. Most of the time converting the property has no issues, but in some cases, this could lead to unexpected results.

