CLEAN : French minister fights for survival after hiring daughters

The video contains a brief statement expressing uncertainty or lack of knowledge.

What does the phrase 'I don't know' imply about a person's knowledge?

In what situations might someone say 'I don't know'?

How can admitting 'I don't know' be beneficial in a learning environment?

What are some alternative phrases to 'I don't know' that convey uncertainty?

How should one respond when someone says 'I don't know'?