What's the secret to becoming a conservatively economical, healthy eating, domestic diva/divo in the kitchen?

I envy domestic divas and divos who are able to plan (whether on paper or in their mind) weekly / monthly meal and shopping lists / schedules.

You know the type: the ones who make big meals during the weekend and creatively repurpose leftovers throughout the week, the ones who make master grocery shopping lists so they need only to shop once or twice a month, the ones who simultaneously practice both conservative economics and healthy eating. How do they do it?!

What’s the secret to becoming a conservatively economical, healthy eating, domestic diva/divo in the kitchen?

Also, what meal-planning method would you suggest for two people who have varying schedules?

Links to online resources are greatly appreciated!