Hello Suraj,
Assuming that you are from computer science background. If not, I would suggest you to learn first and foremost a basic programming language like BASIC/C. Specifically the loops (IF-THEN-ELSE, FOR, DO-WHILE). Then learn some basics(Primary Key, Joins, Normalization ...) of database. This will give you basic strength to move to QlikView development world. Once you are armed, try to understand how various concepts like Set Analysis, AGGR, Count(If()) Vs If(Count()) work; what is the approach of evaluation of expession. You would get materials for these in the forum. But my suggestion would be to try different combinations with those expressions on your own. This littile R&D would give you a lot more confidence and you would hardly forget the learning got in your practical experience.
Try yourself again and again to break and at last community is there for you.
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