Hi Ranjan,
There are many notifications options available within the SAP Support Portal that require you to subscribe. Some require filters, some are based on 'subscribing' to Spotlight News or to specific notes and KBAs.
For more information on these, check out SAP Note & Knowledge Base Article Notifications | SAP Support Portal
We also have a Twitter account (@SAPSupportHelp) and Facebook page that we use to share and engage.
Let me know if these are of assistance to you.
Thanks,
Kristen