Recipes are combinations of ingredients and techniques that are a guideline to producing the final dish. I know, sounds obvious, but note that I said they are a guideline. New recipes come about because somebody didn't follow the old recipe and discovered they liked the new one better, or for a different purpose. Recipes are not, with few exceptions, hard and fast rules that must be followed to the letter or the result will be inedible. Most recipes have wiggle room. That's why your grandmother's a pinch of this and a dash of that seemed so infuriating. You wanted exact. She was telling you how to cook.
Use these recipes as guidelines. It's probably a good idea to stick pretty close to the recipe amounts the first time through, at least until you see how it comes out. Baking recipes have less flexibility than, say, a pot roast. I have cooked all the recipes you'll find here, or trust the person who's name is on the recipe so much, I'm including it, even if I haven't tried it myself yet.
I am splitting these into basic categories, with some commentary, but if you are looking for something specific, try the search box. It will look through the whole site.
I'm also including my favorite Cookbooks.