Hi Raju,
to start with basics
1. you should be know the controls in document types, item categories and schedule line categories.
2.document type is one of the parameter in item category determination . Also know about other parameters used in item category determination.
3. item category is one of the parameter in schedule line category determination.
4. requirement type and requirement class.
requirement class will transfer the requirements of a sales doc to MRP( Material Requirement Planning)
requirement type will help in determination of requirement class.
special stock indicator in requirement class and its purpose.
5. Prerequisites for transfering sales order requirement to MRP.
6. Prerequistes for availability check.
7. Delivery types and controls
8. Delivery item categories, controls and determination
9. Billing types and controls
10. Delivery scheduling(backward scheduling and forward scheduling)