What are the Prerequisites to Learn QlikView step by step?

The basic pre-requisites for Qlikview will be similar to what is required for other BI tools:
** Any programming Language syntax including
     >> Functions
     >> Loops
     >> Date conversion etc
** Database Knowledge
     This includes:
     >> TSQL
     >> Data Modelling
     >> Data Warehousing
     >> ETL etc
** Visualization Knowledge
     >> UI designing
     >> Chart and other Objects usage and requirement etc
** For Advance users
     >> VB Script
     >> Macro Knowledge
     >> Extension Objects etc
Then further things get bifurcated into QV Developer or QV Administrator.
Hope this was helpful or correct as per request.