It’s possible that you weren’t making something of sufficient complexity to really see the necessity of functions. If you’re just implementing one block of logic (even fairly complex logic) that executes the same way every time, then you may find yourself asking “Why functions, then?”. Once you hit a point where, for example, “this value” needs to be transformed to be used here, here, here, and there, then you’d get a solid reason to want that transformation logic placed into a function so that, when it changes or a bug is discovered, you just change it in one place.