Hi Ajay,
if you're new at SAP you might want to start in the new SAP Learning HUB
https://training.sap.com/shop/learninghub
There are a few free courses that will help you get a general gist of what SAP is and where SAP SRM fits.
I think it is useful to have a generic idea about SAP ERP, module MM, before getting into SAP SRM.
Once you grasp this concepts you can go ahead with the wikis and help pages suggested. And of course, a SAP training in SRM would also be very useful.
regards,
Edgar