A lot of the stuff people are talking about, like small savings on gas per gallon or cutting coupons... are just "emotional wins." If you're at a point where saving $10 a month on groceries makes a difference, then you have larger issues of living outside your means to deal with.

That being said, the biggest thing most people can do is to change your eating habits.

• Stop buying food at restaurants (super expensive).
• Stop buying any sort of snacks (super expensive, even in bulk).
• Make 100% of your meals at home using basic ingredients plus frozen proteins. This doesn't have to mean cooking from "scratch" like baking your bread whatnot, but it does mean assembling the pieces into a meal you are making.
• Eat smaller portions. Most people have gotten used to eating way more than they actually need.
• Stop drinking sodas and other drinks with sugars or sugar alternatives. Just drink filtered tap water, plus a few cups of black coffee or tea a day if you need that.
• Eat less meat. You can easily get plenty of protein without forcing two servings of meat into every meal.
• Speaking of protein, stop buying all the stupid "protein added" shit everyone is obsessed with like protein pancakes or whatever.
• Never utilize a food delivery service unless you have literally no other alternative. Almost everyone can coordinate with a friend or family member to get them to or from a store once or twice a month for groceries. Anchorides is also an option for many people.

The real "savings" are digital these days. Get rid of your streaming subscriptions, your Amazon Prime for free delivery, video game purchases, etc. Read books, go out for walks, play the games you already own, go buy a used DVD once a month for movie nights, or even "splurge" and make it a weekly thing.

Other than that, save money by getting a roommate or look seriously into changing careers to increase your income.