You want the ones that talk about CAPABILITIES, not how someone used them in a specific case (this is only needed as an example of work).
You don’t need a lesson on how to open a door to the unreal, you need a lesson on how to get a signal that the user pressed a button on the keyboard, how to change the roattion of the door, how to do it smoothly etc.
Knowing this, YOURSELF can make it possible for the door to be opened, and besides, if you need to open not a door but a window - you already know what to do.
This is necessary because you are unlikely to find a guide to solving your specific problem. The problems can be VERY DIFFERENT, but they can all be solved by a narrow set of general methods, which are exactly what you need to try to learn.
For example this is a cool channel that talks about the engine’s capabilities.