We don't really have "hacks." The important thing is to pay attention to the big money decisions (house, mortgage, cars, schools, marriage partner) and then you don't have to worry about whether someone's buying Starbucks lattes or making your own laundry detergent.
We married young, had no student loans (parents paid for my in-state school, DH went to a service academy), lived on one income and saved the other, saved a huge amount for our house down payment, paid the rest off in five years, invest half our income.
Ways we're cheap: public schools for the kids, drive cars into the ground, Costco and Walmart over Wegman's for most things.
Extravagances: boat, cleaning service, a couple moderate vacations per year.