Development life cycle of a product

Specifications, which is the conceptual part of the process (technical requirements, task assignments and so on.). For more information, see Specifications.

Development, testing, and deployment, which are the designing and publishing parts of the process. For more information, see Developing and Testing and Building and Deploying.

Deployment into QA and Production environments. For more information, see Deploying to QA and Production environments.

Maintenance which is mainly achieved through GIT branching and tags. For more information, see Maintaining.