planning to learn SAP HANA

Hi Friends,

i have an 3 years of experience in standard SAP ABAP.

In future i want to learn SAP HANA.

so what are the areas i have to be strong (i.e) prerequisite for HANA.

AND is it is useful for me to learn SAP HANA ?.

in future can i MIGRATE to SAP HANA?.

Please help me friends.