What are the best cooking hacks you've learned over the years?

Biggest hack? Realizing that humans have been cooking for millennia, and that it's in the best interest of big business to convince you that it's difficult/expensive/extremely complicated.

You don't NEED the fancy equipment every company out there is trying to sell you.

Not everything needs to be gorgeous on the plate, or a whole production to make.

The poorest people in the world cook delicious food every day.

For instance, you don't need NEED a +$150 Japanese chef knife to cook at home. What you need is something that can hold an edge through general maintenance, a whet stone, a kitchen towel to dry off your blade immediately after you hand wash it, and a little bit of patience.

IKEA sells some surprisingly great single construction (steel blade, steel handle) knives, and their single body chef knife is like $25. Just get an honing rod for use before you start slicing, and a whet stone for periodic sharpening (there's TONS of YouTube videos of all the different ways of sharpening your knife), and remember to wash and hand-dry after you're finished. My chef knife cost me barely anything, and I've used it for years and years, and it still slices through a tomato without a problem. Also, I only cook for myself, so I can absolutely 100% guarantee my whet stone will "outlive" me.