Hi Haridas,
Use team member Prakhar's links. i will just add a little:
Projects itself has 2 obejcts task list anc cycle, by task list you perform all basis activities such as import Transports from DEV to QAS and so on.
The Cycle is a crm document or business transaction, with standard phases ( same for Impl and Maint). Each Phase has own possibilities and restriction for Task list and Change Documents that linked to cycle.
Just read a bit and test.
Rg Dan