Getting help online can be difficult. People get mad at you, they do not understand your question, or the answers you get are not correct. What do you do? Well, you watch this video and learn how to ask the right question the right way to get the right results.

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Source Code: https://leadmagnets.app/?Resource=Int...
Design Patterns as referenced in the video    • Design Patterns: Don't Repeat Yoursel...  

0:00 Intro
1:06 Demo application walkthrough
4:50 Explaining the problem: putting instances of different classes (product models) in one list (shopping cart)
7:54 Creating an interface
12:53 Implementing the interface
20:29 List of type Interface
23:43 Note about items in the List of type Interface: Accessing a Class member not in the contract
(Interface)
25:07 recap: basics of the Interface
26:48 Class Inheritance and Interface
implementation
29:02 Extracting the Interface from a Class
31:19 Interface implementing another Interface
34:54 Accessing a Class member outside the initial contract (Interface) in the List of type Interface
40:51 Power of Interfaces: Adding a new Class to your project, why to use Interfaces