Use Case - Difference between Include and Extend Notation

I see people always struggling with include/exclude notation inside use case diagrams. I think these diagrams could explain it better. use case diagram include…

What is Use Case Relationship? Include, Extend, Generalization - Binary Terms

use case - uml-include or extend - Stack Overflow

UML use case include relationship shows that behavior of the included use case is inserted into the behavior of the including use case.

Exploring the Use Case Diagram

UML - Use Case Diagrams

UML Use Case Diagram - Javatpoint

Putting The Inclusion Use Case In Focus - Business Analyst Articles, Webinars, Templates, Jobs

Use Case Diagram Enterprise Architect User Guide

Solved Show the relationship between the problem statement

Use case diagrams are UML diagrams describing units of useful functionality (use cases) performed by a system in collaboration with external users (actors).