The RedHat Objectives published at https://www.redhat.com/en/services/training/ex294-red-hat-certified-engineer-rhce-exam-red-hat-enterprise-linux-8?section=Objectives
* Understand and use essential tools
System Documentation
Linux documentation is your friend during the exam some of the commands you can use to view the documentation :
1. MAN
2. INFO
3.
* Operate running systems
* Configure