I have found that there are different skills you need to learn if you’re going to make food for 1-2 people vs 4 people or 6+. You’ll find that you can’t simply scale up every recipe you have and that some recipes would require a commercial kitchen to achieve for larger groups. The best you can do is know your kitchen and equipment and its limitations. For example, if I make crab cakes, I need a pan to fry them up in. My pan only fits 4 cakes and you need 2 per person. So what is the solution if I’m cooking for 4 people? You can add another pan if you have one and have another burner open or you can set the oven to a low temp to keep the first batch warm while you cook the second batch. Some items I will cook in the oven instead on the stove if I’m cooking for more people, but then you need to make sure you’re not using the oven for something else. Aside from that, lots of things scale up well. I’m actually living temporarily with my parents and will scale up certain dishes simply by doubling the amount. If I make pesto with chicken, I have a large cast iron pan that I cram 4 chicken breast halves into and then add pasta to a pot in twice the quantity. Then of course there are large scale meals. I’m taking 6+. I usually try to utilize an outdoor grill in this case and make lots of sides ahead of time that can be served cold or warmed up. I hosted Thanksgiving once and I had to make a planner for the meal to make sure I had all the pots and pans I needed at the right time. Don’t know how people do that every year, but it was fun to do once and I learned a lot. I had to cut dishes out because I only had so much oven space or burners or dishes to put them in. In the end, you’ll learn with practice.