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…

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1 below shows the basic use case notation. An actor (stick figure)

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include or extend in UML? - Stack Overflow

What are Include and Extend Relationships in a Use Case Diagram?

UML use case diagrams graphical notation reference - subject, actor, use cases, relationships between them, extend, include.

Comparing and Contrasting Use Case Model Elements, Part 1 - Business Analyst Articles, Webinars, Templates, Jobs

Include” and “Extend” Use Cases - Visual Paradigm Blog

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