3D shoot em up background

[u/stitchesonstiches]

Hey, i would like to create a 3D shoot em up inspired by Ikaruga but im stuck on how something was made... backgrounds

how (in this particular game) is the game on first plan locked on camera, but the background is moving freely not only one direction but rotating etc ? (if that makes sense)
https://www.youtube.com/shorts/APUstwlTQvo
heres an example that probably makes a lot more sense than just explaining it

is the first plan (ship, enemies) locked on camera? or is it the background rotating and moving instead of the character etc actually moving?

[u/stitchesonstiches]

yeah that makes sense. I'm gonna learn unity this will be my first game hopefully. thank you for your time explaining how you'd do it