Hi,
You can read more about XS engine here at the HANA Developer Guide - http://help.sap.com/saphelp_hana/sap_hana_developer_guide_en.pdf.
I would suggest that you enroll for openSAP course on HANA Native Development(using XS Engine) at - https://open.sap.com/course/hana1-1
All the best.
Best Regards,
Ashok.