Agile Testing is a fast and informal testing process. In simple terms, we can say that it is specified as an advanced and dynamic type of Testing that is performed regularly throughout every iteration of the SDLC (Software Development Life Cycle) by the agile test engineers

Agile Development
Principle #8: Agile processes promote sustainable development. The sponsors, developers, and users should be able to maintain a constant pace indefinitely.
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What is fail fast? Fail fast is the principle of freely experimenting and learning while trying to reach the desired result. By quickly finding the failures, you can catapult learning and optimize solutions instantly to reach your goal. The concept of fail fast is strongly connected to the Agile methodology.