What money saving hacks are actually worth the effort?

[Madison12]

There are endless money saving hacks out there, but some seem to save pennies while costing dollars in time and effort. What money saving hacks have you found actually worth implementing? I'm looking for approaches that save meaningful amounts without requiring extreme lifestyle changes or hours of work each week. Which money saving hacks give you the best return on your time investment? How do you separate the truly valuable money saving hacks from the gimmicks?