Come on now, try the search function.
A quick summary of the most commonly used RAID levels:
RAID 0: Striped Set
RAID 1: Mirrored Set
RAID 0+1: Striped Set + Mirrored Set (4 disk minimum)
RAID 3/4: Striped with Dedicated Parity
RAID 5: Striped Set with Distributed Parity
RAID 6: Striped Set with Dual Distributed Parity
So two 36Gb drives will give you approx 72GB, enjoy.