If you like learning something new using a step-by-step process, try the Tutorials on the Oracle Linux 8 documentation library. You will find tutorials about installing system services and system configuration using Cockpit and on the command line.
These Tutorials provide you with quick procedural instructions to get you started with technologies available in Oracle Linux 8. The Tutorials are tested on Oracle Linux 8 systems but can be used as guidelines for equivalent steps where the technology is available on Oracle Linux 7.
To complement your learning, consult the Oracle Linux 8 documentation This documentation is modular and topic oriented to make it easy for you to find relevant content. The documentation library includes content that is specific to Oracle Linux 8 as well as generic content that can guide you on Oracle Linux 8 or on other Oracle Linux releases, such as Administering SELinux, Using OpenSSH and Managing Certificates and Public Key Infrastructure.