I try to find something in this forum about ideal commands for the cronjob, but with no luck.

I am new to all about websites, but I like to learn, and I am looking in some webs about to understand this thing of cronjobs, and one of them was very good showing me the hows

My request is that wish recommendations of timings for the cronjob or commands are more likely to be use in the general settings for the emails, in order the works fine for easy social