what are the commonly used and most important concepts in BW HANA

Hello All,

am a BW developer and working on BW4HANA project. in future we have to work on HANA modelling part too. what are the most commonly used and important concepts in HANA that related to HANA Modelling ? i would like to get some knowledge on those concepts or tools.

Thanks in advance.

Ravi Kiran