Procurement Account Rules Conditions

New to Fusion. Are there any documents and / or videos that detail how to create conditions in Procurement Manage Account Rules? I find the documentation very confusing and only shows examples but not detailing best practices for writing the rules or what all the fields available represent.

Also, is there a way to see Account Rules / conditions used while generating the charge account for a requisition or PO? For example, 3 rules and rule 2 was actually applied during the current transaction? We have more rules than 3 so it becomes a bit cumbersome to see which rule generated the account.

Any assistance much appreciated.