This book is designed for readers who have completed the previous volumes in the series— Classical Mechanics , Quantum Mechanics , and Special Relativity and Classical Field Theory —though it is approachable for anyone with a STEM background.
: You can view an official PDF sample of the book's introductory pages on the Penguin Books CDN Official Video Lectures
Use the UPD PDF as your reference while watching the 2022 lectures (the "COVID era" recordings, which are higher quality than the 2012 ones).