I always cook for myself alone which means I’m used to cooking just one portion, or 2 portions which I end up eating in one sitting anyway. I usually improvise my meals and my brain just seems hardwired to measure quantities for a single portion meal. Does anyone have any tips for scailing your cooking up to cook for groups?
find a professional cook book. these books teach you how to calculate recipes and scale them (even in relation to whether something is a side dish or mains, they also include tips on calculating waste/trimmings and what to do with them). check your local library. i think there is a starter course from the culinary institute of America, in German there is “der junge Koch”