I usually start with Food Wishes, Serious Eats, or the New York Times. Julia Child for French food, Just One Cookbook for Japanese food. Budget Bytes when the bank account is looking a little thin. Dessert Person when I have a lot of time and want to knock the socks off my friends.
Depending on what I am making, but I regularly use Serious Eats and The Mediterranean Dish for cooking and mostly Sally’s Baking Addiction for baking.