Hello everyone! I'm studying string theory at a graduate level and want to focus on ADS/CFT correspondence. The problem is that I don't know where to start from. I've already learned the bosonic string, some elements of CFT (and BRST quantization), T-duality and how the D-Branes enter the game, some of the D-Branes's properties (like the world-volume action, the coincident D-Branes and the gauge fields that arise etc.) and the way one constructs black holes using D-Branes. I've also studied QFT at a quite satisfactory level. When it comes to susy, though, I know almost nothing. What should be the best way to proceed then? I've found 2 reviews that seem pedagogical, namely http://arxiv.org/abs/hep-th/0201253v2" [Broken], which contain some basics of susy and supergravity. Should these papers be enough for my purposes, or am I supposed to read something more complete such as the chapters 4,5 of GSW or Becker, Becker and Schwarz? Moreover, could someone pinpoint me the differences between the world-sheet susy and the spacetime susy? Why can't we have both types in our theories (or do we have so)? When one uses, for example, type IIB superstring theory for ADS/CFT, in which of these two cases do we put the theory? I'd be really grateful for some help here..