Valve's manual for the Vive virtual reality dev kit is as fun as you'd expect - Polygon
Oculus Quest 2 and Oculus Rift S User Guide For Seniors: A Complete Guide with Tips to Master Your Oculus Quest 2 and Rift S: Seaman, Antonio, Seaman, Antonio: 9798589771664: Books - Amazon
Oculus Rift CV1 Teardown - iFixit
Oculus Rift Setup and
Oculus Quest 2 and Rift S User Guide: The Complete User Manual for Beginners to Master the Functionalities and Features of Oculus Quest 2 & Rift S, Campbell, Curtis , eBook - Amazon.com