Hi,
good for learning ABAP BI related.
As my exp first learn the
1.internal tables (standard,shorted,hashed tables)
2.read,append,collect statements.
3.filed symbols in start routines and result package and source package in start and end routines.
4. filed level routine,start,end routine and expert routines.
5.DTP and programs debugging.
6.customer exits- I_steps1,2,3,4 in BEx reporting.
in Google so many docs available about BI related ABAP.
Thanks,
Phani.