journalctl -u

Logs for one unit

low risk

interactive breakdown — edit the command and press Explain
$ 
What it does

Shows journal entries for a systemd unit.

Examples
journalctl -u nginx --since "1 hour ago"Recent logs · explain & risk-check →
journalctl -u nginx -fFollow · explain & risk-check →
Related
journalctl
Open the full explainer →More in System & Processes

Reference text is hand-written and may be incomplete — check man journalctl for your version. Test destructive commands on a non-production system first.