Can someone suggest a good online resource for learning how to run a restaurant?

Hey folks. I was scrolling Instagram while waiting for a delayed bus in the ENG rain. A post caught my eye about a chef with a packed dining room who was barely breaking even. What grabbed my attention was a story about an Italian place selling pasta for $14 that cost $8 to make. That 57% food cost felt painfully familiar, as I am likely doing the same with my pies. I am really satisfied with this guide because it walks you through the formula to figure out what you should charge. It includes a free calculator too. You can read more here if your weekends are busy but your bank account is empty. It helped me spot items draining my profit.