How many records can be shown in matrix, tabular and summary report?

Unfortunately, objects with a Master-Detail relationship are the only ones that can access roll-up summary data; objects with a Lookup relationship cannot.

No, Salesforce cannot be deleted. Although, they can be deactivated. Doing so, a user can be prevented from logging in into Salesforce, but their data doesn’t get hampered.

SOAP or Simple Object Access Protocol helps developers to interact with Salesforce using standard message technique and return the data in XML format. It is a protocol system for accessing web services in Salesforce.

Transfer Record allows profile to transfer all records for object if profile has Edit access of the objects.

Workflow is a set automated action that can be triggered by a particular event of actions including field updates, email alert, task creation and outboard message.