It was a learning experience.

Meaning

Although it might have been difficult or unpleasant, it resulted in valuable knowledge.

Examples

• John: 'I failed my driving test.'
• Alice: '<b>It was a learning experience</b>. Try again!'
• John: 'Yes, but <b>it was a learning experience</b> for next time.'
• Alice: 'The presentation didn't go as planned.'