How to use my Mac to manage "to do" lists?

MacBasics for iCal says that "New Reminder" is an option under "File". Not on my device, it's not!

Is it possible to set up a categorized and date/time-connected "to do" list on my Mac? (without paying $50 for the "Things" app?)

(I do not have another device, so iCloud is not an option for me.)