SAP BASIS for beginner with database (Oracle/DB2) background

Hi ,

I am basically from Oracle/DB2 database background , the place I am currently working is mainly using SAP, I also have interest in learning ERP so would like to start learning SAP BASIS and write some certification exams, but not sure from where to start 😈 , looks like it is very hard to get some guidence until you join some training institute , could someone please guide which certification best suits me as a beginner ?

Kind Regards,

Chaitanya