Hello Arun,
I see that your course of interest is SAP HANA but in order to understand SAP HANA concepts, you need to follow the below path.
1. Firstly, learn the ECC 6 and EHP 7 (Sales and Distribution module) and get certified in the SD module.
ECC- Enterprise Central Component
EHP- Enhancement package
2. Then you can go for SAP HANA module and you will understand the concepts clearly.
If you have any further questions, feel free to ask me.
Regards,
Krishna Chaitanya
SAP FICO, ECC, S4HANA Consultant