The core of Agile is mindset; the picture below demonstrates the relation of agile mindset, Agile values, principles, methodologies and tools. When a organization work with an Agile mindset, and really rock-solid product management, Agile methodologies and tools will evolve out of that.
Agile Manifesto / Key values
The four key values have two sides, more emphasis on the left side of the statement over the right. A good way to think about the manifesto is that it defines values, not alternatives, encouraging members to focus on certain areas but not eliminating others.
The Twelve Agile Principles are a set of guiding concepts that support project teams in implementing agile projects.
The shorten 12 agile principles