I started making food in bulk, and froze it, and food prepped on Sunday so I didn't have to make food every day, just grab and go. Saves a LOT of time.
To this day, I do the same thing, and have not changed anything, because that stuff got ingrained in me. I don't really have dumb mistakes with my money, too much, as I am super careful and have priorities.
But, if you are poor, what can you do? You still have to work and try to get out of poverty, even if you are tired. So one should try to think what they can do to get the best payback for everything they do, and do that first.
Like if you're poor but still own a car, and driving to work takes $50/week in gas, then maybe buying a bicycle and bicycling to work might save $2,500 per year in gas. If one is healthy enough. I'm not saying to do this - it is just an example. But still, if one could, that's an easy $2,500 per year. Then you take that money and use it to buy toilet paper, beans, rice, and other staples in bulk. This means you get a discount for bulk, PLUS you don't have to go buy them every week and take time and effort to do that.
I hope you get what I'm talking about.