Red Hat Website  listed the objectives outlines as follows:

Source: https://www.redhat.com/en/services/training/rh342-red-hat-enterprise-linux-diagnostics-and-troubleshooting

Understand and employ general methods for troubleshooting

  • Collect system information to aid in troubleshooting
  • Consult documentation resources to aid in troubleshooting
  • Monitor systems for vital characteristics
  • Configure systems to send log messages to a centralized host

Diagnose and troubleshoot system start up issues

  • Identify and resolve service failures affecting boot
  • Regain root control of a system
  • Troubleshoot boot issues
  • Identify hardware and hardware problems
  • Manage kernel modules and their parameters

Source and References: Redhat Website