Linux has several complementary ways to run a command at a specific time or on a recurring schedule: cron (recurring jobs managed per-user via crontab or system-wide via drop-in files under /etc/cron.d/, /etc/cron.daily/, etc.), at (one-shot jobs — "run this once at 3am tomorrow"), and anacron (catch-up runs for daily/weekly/monthly jobs when the machine wasn't powered on). A separate, more modern option is systemd timers — covered in the Services domain. On the RHCSA you'll almost certainly be asked to create a user crontab entry or schedule a one-off at job.
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