Kitchen tools.

About the only "life hack" of any sort I can reasonably advise: save those liquid medicine measuring cups. They're amazing for cooking and baking. A total of 3 teaspoons of this and that? Easily tossed in. A tablespoon of a liquid? Measure it out and then set the little cup down onto a flat surface. They're astonishingly handy to the point I'm routinely pleased at them.

There may well be a nicely polished, stainless steel version of these little cups at a restaurant supply store somewhere, or well-crafted ceramic equivalents, but neither of those also give me the rewarding feeling of having found a new use for an old object.