Physics Pages
A technical, straightforward collection of notes covering electrodynamics, quantum mechanics, relativity, astrophysics, string theory, and more.
Site Description:
“PhysicsPages contains my notes on various topics in physics. The site is fairly technical, in that I use whatever mathematics is required to explain the various topics. It is most useful to those who are either taking a structured course at a university or online, or to those who are working through a topic on their own.
Although I’ve tried to make most articles self-contained with links to earlier posts, there is no substitute for a good textbook and/or an organized course. As such, I’d strongly recommend you buy a textbook and use that as your primary source.
There are also many good courses available online for free at such sites as edX and coursera. There is a large collection of lectures on several areas of physics given by Leonard Susskind on his Theoretical Minimum site. The lecture notes of David Tong are also an excellent resource.”