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I’m a beginner in . I dont have much experience with OOPs so i’ having difficulty understanding interfaces.

I dont know why but I seriously dont get interfaces. I dont know how to use them correctly. Interfaces really confuses me( also dependency injection using interfaces)

In the video he explains how to create a struct which implements the interface and now you can access different methods.

But I could have simple a method and accessed it with that struct instead.

Can anybody please explain in not so beginner friendly way?