How to animate a satellite deploying solar panels?

The User Guide has a good tutorial that will give you the basics of moving layers in 3D space in the Beginner Section. It is titled Position 2D layers in 3D space,  There are also basic tutorials in the Learn Workspace inside After Effects and on the Home Screen. The tutorials on the Adobe Site and the Learning Resources on the Product pages will efficiently and correctly show you how the UI works and how to manipulate layers. These resources are more likely to point you in the right direction than tutorials you will find with an internet search because most of the new free ones are prepared by enthusiasts that don't explain things very well or have come up with inefficient workflows. 

Anything to do with folding is merely a matter of strategically placing anchor points and parenting elements in a sensible hierarchy. The setup takes longer than the simple rotation animations of the 3D layers than... The only thing to fear is potential confusion and gimbal lock issues on complex structures, but simple stuff as in the video is realyl not that complicated.

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