Notes related list is missing in record detail page to capture notes in salesforce - Salesforce Globe 4u

Solution: Need to enable notes feature in order to add notes related list

Step1: we need to enable notes feature first.

Go to setup --> Feature Settings --> Sales --> Notes Settings --> enable the 'Enable Notes' checkbox.

Step 2: Add the Notes related list to the respective page layout 

That's it. You will be able to see Notes related list to add new notes.

Enjoy learning salesforce.