1.What is many to many relationship?

http://infallibletechie.blogspot.in/2013/03/how-to-create-many-to-many-relationship.html

2. Encrypted field?

http://infallibletechie.blogspot.in/2012/11/encrypted-field-in-salesforce.html

3. Debug log?

http://infallibletechie.blogspot.in/2012/08/example-for-systemdebug-in-salesforce.html

4. Explain import wizard?

http://infallibletechie.blogspot.in/2012/08/import-wizard-in-salesforce.html

5. What is the use of VLookup function?

http://infallibletechie.blogspot.in/2012/11/vlookup-in-saelsforce-validation-rule.html

6. How to use Multiple approvers for Approval process?

http://infallibletechie.blogspot.in/2013/01/multiple-approvers-for-approval-process.html