Development, testing, acceptance and production
https://blog.chizobaogbonna.me/having-different-variants-debug-staging-release-of-your-app-on-a-single-device-2efdcaaf4950
https://www.onlinecomputertips.com/support-categories/networking/646-what-is-a-dmz
internal network vs perimeter
https://dev.to/aws-builders/jump-over-a-hurdle-of-working-with-amplify-backend-environment-c77
https://en.wikipedia.org/wiki/Development,_testing,_acceptance_and_production
https://oroinc.com/b2b-ecommerce/blog/testing-and-staging-environments-in-ecommerce-implementation/
https://medium.com/the-liberators/want-to-be-agile-drop-your-dtap-pipeline-7dcb496fe9e3
https://www.bmc.com/blogs/what-is-shift-left-shift-left-testing-explained/
https://blogs.vmware.com/management/2013/11/features-for-thought-series-vcac-6-0-simplify-application-deployments-across-any-environment.html
https://enterprise.arcgis.com/en/server/10.3/administer/linux/arcgis-server-in-development-staging-and-production-environments.htm
https://learn.timextender.com/courses/259790/lectures/4029947
https://humanitec.com/blog/kubernetes-environments-basics
https://blogs.oracle.com/openomics/leveraging-a-disaster-recovery-site-for-development-part-2
