How to add a business logic to track saving a record or modifying a record and display pop-up on a certain condition

I have to implement a business logic where I need to see value of a field for all records whenever a new record is added or modified.



I need to display  a popup too to not allow adding a record whenever a certain condition is met



Is there any documentation link or way we can do this through business logic



I could only see this https://academy.bpmonline.com/documents/technic-sdk/7-13/section-business-logic