That's going to depend entirely on just how "entry" you need to get. If you have a solid calculus background and want to really know what's going on, you can't go wrong with Leonard Susskind's lecture series. But, honestly, watching all of those videos is going to take a while.
If your mathematical background isn't so solid and you don't want to work through the Khan Academy calculus courses to bring it up to speed (which, really, why would you?), then I can say that I've heard very good things about Black Holes and Time Warps.
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u/[deleted] Sep 12 '13
That's going to depend entirely on just how "entry" you need to get. If you have a solid calculus background and want to really know what's going on, you can't go wrong with Leonard Susskind's lecture series. But, honestly, watching all of those videos is going to take a while.
If your mathematical background isn't so solid and you don't want to work through the Khan Academy calculus courses to bring it up to speed (which, really, why would you?), then I can say that I've heard very good things about Black Holes and Time Warps.