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• Troubleshoot a Linux service without guessing

  A repeatable path from a failed systemd unit to useful evidence.

• Build a service inventory with PowerShell

  Collect a useful Windows service snapshot before making changes.

• A practical DNS troubleshooting checklist

  Separate resolver problems, stale answers, and application failures.

• Backups are only useful if you can restore them

  Plan a small restore drill and capture evidence of recovery.

• Write Bash scripts that fail clearly

  Make a small operational script easier to inspect and rerun.

• A small Git workflow for infrastructure changes

  Make configuration changes reviewable and easier to roll back.

• Review SSH access before hardening it

  Reduce lockout risk while reviewing a Linux server’s SSH configuration.

• Write incident notes the next person can use

  A concise handoff format for troubleshooting across shifts.