Ben you are all good, we are all here learning together. Someone more talented than I will likely chime in and let you know how to do it correctly beyond my (also rookie) methods.
And that is a good thing. In this manner we can all learn.
But when you want to stack or display images up and down or left to right, there are several ways to do it, depending on your skill and preference.
You have to go with what you know or can find out, but you will expand and certainly grow your repertoire!
Keep at it!