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A Red Hat training course is available for RHEL 8

Chapter 19. Options for running a RHEL 6 or 7 application on RHEL 8

To run a Red Hat Enterprise Linux 6 or 7 application on Red Hat Enterprise Linux 8, a spectrum of options is available. A system administrator needs detailed guidance from the application developer. The following list outlines the options, considerations, and resources provided by Red Hat.

Run the application in a virtual machine with a matching RHEL version guest OS
Resource costs are high for this option, but the environment is a close match to the application’s requirements, and this approach does not require many additional considerations. This is the currently recommended option.
Run the application in a container based on the respective RHEL version
Resource costs are lower than in the previous cases, while configuration requirements are stricter. For details on the relationship between container hosts and guest user spaces, see the Red Hat Enterprise Linux Container Compatibility Matrix.
Run the application natively on RHEL 8

This option offers the lowest resource costs, but also the most strict requirements. The application developer must determine a correct configuration of the RHEL 8 system. The following resources can help the developer in this task:

Note that this list is not a complete set of resources needed to determine application compatibility. These are only starting points with lists of known incompatible changes and Red Hat policies related to compatibility.

Additionally, the What is Kernel Application Binary Interface (kABI)? Knowledge Centered Support article contains information relevant to kernel and compatibility.