Beginner with Kirby cms, does anyone have knowledge on creating a lunch menu with different categories that could be edited on the panel?
Maybe try a structured field for each type of food in the menu.
You could also mix subpages for categories with structure entries within each subpage, e.g. subpages in menu page:
Then define a structure field in each subpage with the fields relevant in that category.
The solution depends on how complex your menu is.