anybody can explain a!save() and saveInto() some little more depth
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saveInto is generally a parameter used in user-interactive components that collects an array of save targets to receive the new value entered into that component by a user. It's not a function hence no "()".
a!save() is a rule which can be added to within the saveInto list of pretty much any component, allowing incredibly increased functionality by allowing a user to save arbitrary values into arbitrary different variables, including but not limited to a transformed version of the incoming value from the component.
Here is an example of an a!textField() component that uses a generic save as well as an a!save() inside its saveInto. I suggest you create a similar interface and play around with it some to really explore how this functionality works.
load( local!textValue: "initial value", local!textUpdated: false(), a!textField( label: "Test Text", instructions: if(local!textUpdated, "(Updated)", ""), value: local!textValue, saveInto: { local!textValue, a!save( local!textUpdated, true() ) } ) )