In this chapter, you have learned how Heroku works, how to transform your application into a slug with dependencies that can be distributed across multiple dynos, making your application scalable. You have also learned that by default Heroku supports the current version of PostgreSQL and the last three versions, and every three years you need to upgrade the version used in your application.

You have also learned about the structure of the Heroku plans and your characteristics, where the Hobby plans are more oriented for blogs or personal websites, while the Standard, Premium, and Enterprise plans are ideal for production applications. You understood that the downtime of each plan must be taken into consideration to choose the plan that is best for your business.

You also got knowledge about the characterization of the Standard, Premium, and Enterprise plans and that there are variations of plans based on the usage of vCPU, RAM, and IO.

Finally, you learned the High Availability feature that manages and monitors the application and database in case of a failure. When a new database is created, the credentials are changed.

In the next chapter, you will learn about the Heroku Toolbelt and all tools you need to get started with using Heroku at the command line.