If you think you cook well because you stir your microwave meal at the allotted time, then you have a lot to learn. Being able to cook well is better for your health, better for tastebuds, better for romance, and offers the DIY satisfaction of combining several ingredients into a unified, delicious whole.
You may think that Martha Stewart only knows how to make decorative baskets with seasonal flowers, but she has a great cooking website with dozens of videos:
British people are cast in movies because of their gravitas, so imagine that knowledgeable tone as you read dozens of cooking techniques on either of these two sites:
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If you insist on learning to cook from a man who appears on PBS in a bow tie and will cook a recipe hundreds of times until it's foolproof, then spend some money on lessons from America's Test Kitchen. (Their book: The Best Recipe, is an excellent resource with the same philosophy and is aimed at teaching you not only the how of cooking but also the WHY)
Learning just a small assortment of recipes can make an enormous difference to your health and well-being. After all, no great night ever resulted out of saying, 'Why don't I nuke some spaghetti?' At least none that you remember.