So the first order of business is, yes, to buy fewer things less often. This is obvious, but most people are conditioned to think that they must have things. That they must shop every weekend. That if things are ‘on sale’ then it must be a good idea to buy them.
Not so.
Every pay period that passes without you buying something means money in the bank. Money in the bank means financial independence.
Yes, you need groceries. Yes, you need a place to live. Yes, you need transportation. Inflation in these areas is a bitter pill to swallow for many working people: they have no choice but to purchase food, pay rent, or put gas in the car.
So the question becomes how you consume these necessities. First, I’d recommend becoming a vegetarian or a vegan. Your grocery bill will drop substantially and your health will improve dramatically. How you live (with a roommate, significant other, or at home with your family) is too personal and varied for me to comment on in general. However, if you’re recently out of school, consider living with your parents for the first year to 18 months of your working life. You can save 75% of your paycheck, and have a nice nest egg to start with.