Because you can re-use the schedules you want to be careful naming them. I’ve seen far to many schedules named Schedule 1 or Job Name Schedule. The first is non-descriptive and the second too specific (it would look silly as the schedule for another job with a different name). Give your schedules names like Every Weekday at 4AM or The third of the month at 6AM. This way when you go to pick the right schedule you know which one is which.
Word of warning (which Kenneth also notes): be careful about modifying those schedules; if you think you’re editing the schedule for just one job, you might actually be modifying schedules for a bunch of jobs.