Your question is Linux Command Diagnostics Workflow. Take a moment with it on the right.
Talk me through your thinking if you like. When you're confident, submit your answer and I'll grade it like a real screen (7/10 or better passes).
How would you use Linux commands to diagnose process, file system, and networking issues on a host? Walk through the commands you would run, what each tells you, and how you would narrow down root cause.