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What is Agile?
Agile is being flexible in delivering Value to the customer. It is The Team sport. You must read Principles behind the Agile to deepen your understanding.
What is Value?
Solving customer problem is Value. Discussion on Value is always a great sign of a good team. But sometimes, Value is relative, depending upon the context.
Best Practices in Agile
The most important practice is experimenting with your approach to efficiently deliver the Most Value to the customer.