There is a lot of material on general relativity available online, including many books, such as this:
Lecture Notes on General Relativity, S. M. Carroll,
http://arxiv.org/abs/gr-qc/9712019
The free online journal Living Reviews in Relativity is
an excellent way to learn more about many aspects of relativity.
One can access it at:
Living Reviews in Relativity,
http://www.livingreviews.org
Part of learning relativity is working one's way through certain classic
confusions. The most common are dealt with in the ``Relativity
and Cosmology'' section of this site:
Frequently Asked Questions in Physics,
edited by D. Koks,
http://math.ucr.edu/home/baez/physics/
© 2005 John Baez and Emory Bunn
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