Cloud Foundry is open source software, but if you are trying to tinker with it for the first time, using OSS is a bit related. You will need a cloud environment with a predefined area, you will install it yourself using MicroBosh, and everything will be done through the command line.
Pivotal Cloud Foundry is a commercial implementation that simplifies the startup and launch process when you study a project. It provides a hosted environment in Pivotal Web Services, so you do not need to install it yourself, a web interface that simplifies environment management, and a number of pre-prepared services, including relational databases and message queues. This is the best starting point if you are just learning technology.
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