Hi Muhammed,
Good Day!
If you are interested in technical line, I prefer you to learn SAP ABAP & PI. If you are interested in Functional line, I request you to learn SAP CRM, SD.
Also, contact nearest SAP Labs and they will provide you the clear picture.
If any questions, please let me know. Thanks.
Have a nice day!
Regards,
Hari Suseelan