You can also see what doesn't work in stories. But all you need to know is that no technique works for everyone, and what's best for you is whatever gets you regularly putting down words and feeling good about them. In a novel, the readers will become invested in the characters and what happens to them.
Think of a short story as being like a trip across town and a novel like a road trip. Accounts of the best and worst in humanity are available in myriad forms. Proofread and edit the story when you are done. Why are the legion troops running? The more of those things that you know about, the more real the world feels.