Hi Ujjwal
You can check the videos in SAP HANA Academy SAP HANA Academy - YouTube for Hana overview.
Also check the ABAP channel for development related information. (e.g. How to Build Core Data Services Views in ABAP on SAP HANA - YouTube
In addition to this you can look at the extensive documentation available in the following links:
Developer guides SAP HANA Platform (Core) – SAP Help Portal Page
ABAP for SAP HANA Reference Scenario - Video Tutorials
good luck
Best
Meera