SAP is blue chip in Market so you can’t say this module is good and this module is not good. But you should start from Basic modules like SAP SD ( Sales and Distribution), SAP MM (Material management),SAP FICO (Finance and controlling), SAP ABAP, SAP BASIS, SAP PM, SAP PS, SAP PP etc. Then you can go fo advance Modules like SAP ARIBA, S4HANA EWM, S4HANA TM, SAP IBP, SAP Vistex, SAP Oil & GAS etc. So better you can start your career as per your area of interest. If you are looking for any training contact- +91 9148251978.