I've been cooking for as long as I can remember. Indian food. I grew up in my family's Indian restaurants and learned a lot along the way.
One of the biggest things my mom taught me was how to taste. It might seem like nothing big, but being able to taste something and knowing its balance is the biggest tool to anyone who wants to cook.
An amazing recipe can be completely messed up by having a heavy hand with salt, or acidity or sweetness. Any type of flavor can easily overpower a palate and ruin the flavor of any dish.