Many-to-Many在EF和EFcore的寫法差異

Relationships寫法EF和EFcore有點差異，發現有個網站有對照版本，以Many-to-Many為例:

EF版本(用Map)
https://www.entityframeworktutorial.net/code-first/configure-many-to-many-relationship-in-code-first.aspx

EFcore版本(用HasKey)
https://www.entityframeworktutorial.net/efcore/configure-many-to-many-relationship-in-ef-core.aspx