Even tho Abstract Factory is one of the most core and central of the Design
Patterns, I have seen no end of confusion about it.
I wanted to see if I could come up with a good example of what this site calls "Variant 2" or "Concrete Factory":
https://w3sdesign.com/
See "Implementation" (Variant 2) and "Sample Code" (Example 2)
I think I have one perfect one:
https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/nio/file/Paths.html
(Okay, not perfect, because this factory only creates exactly one kind of product, not a family of compatible ones to be used together.)
That site is one of my favorite of all the ones I researched for both the Links page and to refer people to when they seem confused about this sometimes confusing topics.
The one thing that several other sites cover that they don't is "Examples of each pattern from the JDK".
Most of the other sites have very confused ideas about at least one or another of the important patterns, so I can overlook this.