Workbook/Guide covering different use cases on Page composer EL expression

Summary: Looking for a workbook or a guide covering following business use cases on Page composer or at least a standard document containing syntax to work on Page composer EL Expressions

1. Hide couple of attributes based on a selected attribute value.
2. Make an attribute mandatory based on a selected attribute value
3. Hide Save and Save and Close button if an attribute value is say 'Test'

Content (required):

Guide to work on Page Composer EL Expressions