This is taken all from 12factor.net. This methodology include the 12 factors or 12 parts of software engineering, which should be used while engineering softwares.
My app should be a follow these 12 factor or confor with as my factor possible.

In my opinion

• It’s most important to get it done.
• While doing any of 12 factors given below(maintaining configs/dependencies management, or trying build,release), read below mentioned best practices.

The Twelve Factors

1. Codebase : One codebase tracked in revision control, many deploys
2. Dependencies : Explicitly declare and isolate dependencies
3. Config : Store config in the environment
4. Backing services : Treat backing services as attached resources
5. Build, release, run : Strictly separate build and run stages
6. Processes : Execute the app as one or more stateless processes
7. Port binding : Export services via port binding
8. Concurrency : Scale out via the process model
9. Disposability : Maximize robustness with fast startup and graceful shutdown
10. Dev/prod parity : Keep development, staging, and production as similar as possible
11. Logs : Treat logs as event streams
12. Admin processes : Run admin/management tasks as one-off processes

References:

• This post is copied from https://12factor.net/ and kept here for my personal reference.