Cron jobs in Linux are simple scheduled tasks that can be set to run commands at specific times. Unfortunately, the syntax isn’t the easiest to use or remember, but in this month’s column I’ll share some examples and tips to help you better understand and utilize cron jobs.

Full article here:
A Primer for Scheduling Cron Jobs in Linux (ServerWatch)

Note that if you have Webmin installed on a system, it may be easier to use that to schedule cron jobs.