Questions About CRON Jobs

I have a couple of questions about rolling CRON Jobs on Elgg:

1. Do we need to roll any CRON Jobs on our Elgg community? Are there any advantages to doing so?

2. What Linux syntax would I need to type into the CRON Jobs section of CPANEL? I know how to roll CRON Jobs in CPANEL, and I looked over the documentation in Elgg to try to read up on how to do it, but it only gives me URL's not the actual Linux syntax I need to type into CPANEL.