Ashley gave pretty good understanding about higher dimensions in this video. I wasn't smart enough to understand this while watching Interstellar and Stranger things.
https://youtu.be/H-XiH2jjKvM?si=UJGxxkW93BUi3NOc
https://youtu.be/H-XiH2jjKvM?si=UJGxxkW93BUi3NOc