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Hi Vinaya,
Yes, there is no online "User manual" for AutoCAD 2017 for Mac, but even if you have AutoCAD 2017 for Mac, I'd suggest you to start here:
http://help.autodesk.com/view/ACDMAC/2020//ENU/?guid=GUID-8B0F08A3-1B25-4E87-8CDA-5BFBC126DC6CYou can find all basics there, including drafting and annotation and basics are the same for several recent AutoCAD for Mac releases.
