You should just stop spending money in general if you can. So many responses are like “buy literal garbage like disposable decorations at the dollar store,” do not do that. Stop spending money on garbage. Every dollar you spend is damage to the environment and more power for the wealthy, just stop it. Stop spending.
Don’t buy entertainment, use archive dot org. Read more. When you like something culture you consumed, give it to somebody else so they don’t try to buy it. Pass entertainment around to your friends.
When you have to spend on things like haircuts, repairs, etc, keep the money in your social network. If you don’t cook, learn. If you aren’t a part of your local grocery distro, join it.

Avoid giving corpos money whenever you can and you’ll save lots of money.

Alkaline and rechargeable NiMH batteries. The price per hours of use favors the cheap brands. A top brand might last longer but you are paying a premium for it. Rechargeable NiMH batteries with a good price to battery life ratio are from IKEA.

I usually by the house brand of anything the first time I buy anything. Cooking ingredients, household chemicals, drugs, tools, and anything else you can think of. I have found a number of places where saving money is not worth it, the difference between organic tomatoes and the conventional ones is huge for example but if you don’t care about tomatoes you may be fine with the cheap ones.

There are a few things I will spend good money on first time through. Basically anything I am not going to have a chance to replace if I don’t like it. I had to replace the floors in a few rooms in my house. When we first moved in and could not afford nice carpet. It took 10 years to wear out the carpet and for us to have enough to replace it. If I had to do it again I would have stuck with the original longer to save a bit more and put in better flooring.

Tbh about everything. Most of retail is just an industrial scale of the addage “a fool and his money will soon be parted”.

Buy second hand, its fine. You probally can figure it out yourself, try to diy. Look at what people are actually doing not the brand of tool they are doing it with. Its a saw, you saw with it, you can get away with sawing a lot of stuff with the same cheap saw.

Soaps are just collections of chemicals, powerwash for example is just dish soap plus water and isopropal alcohol.

You can probably cook it at home. It will probably be better and better for you, because a pound of lard or cup or sugar looks like the red flag it is when you go to cook with it.

Your bed might be better on the floor, then on a frame.

You are probably better off walking or biking then driving.

You probably don’t need to watch more shows anyways so why get fleeced to subscriptions. You probably don’t need to play games as much so you can pass on that game. You probally don’t need to go out for a drink. You probally don’t need to go out for a meal. Etc etc

Honestly, I’m a hypocritical ass saying some of this, but its true. The urge to go spend spend spend, isn’t a fluke its just successful sociol engineering to separate us fools from our money.

T-shirts. Get a 5 pack each of white, black, and another color you like. There, you’re set for like a year for $30.