Hi MV
Glad to hear you are looking at training
I recommend you go to SAP Training and Education site to look at available courses. I can't really comment on Basis as Security/GRC is my background
Security Course ADM940 will cover the SU01/PFCG/SU25/SU24 transactions and authorisation concept (check out http://scn.sap.com/community/security for SCN security community further advise)
GRC Access Controls is GRC300 course code
In addition, there are other courses depending on what you need to learn. Delivery methods and cost will depend on your location so you'll have to discuss with SAP (sorry I don't work for them). They do have classroom and online delivery depending on the course.
Regards
Colleen