In Harry Potter, particularly books 1 & 2, the overarching conflict is unraveling a mystery, (What is hidden in the castle? Who opened the Chamber?). Within this larger conflict, the characters engage and complete numerous smaller steps, some planned, while others are unexpected. As they progress, each resolution leads to the next step in the plot.
A conflict can be rooted in the main plot, it can be rooted in a relationship between characters, or it can be both. Here are a few strategies for creating a new conflict in a scene.
Commercial fiction is written to entertain, but audiences can be very picky about the type of story they want to read or watch. Most genres engage the same issues as literary and mainstream, but they engage the issues within the genre framework, disguising a familiar topic in the trappings of their genre.
To a writer, every story is unique, but words like “unique”, “good”, and “interesting” are almost meaningless by themselves. People need a frame of reference. Publishers need to know what kind of story they’re reading in order to evaluate it properly, and audiences need some way of deciding whether this is the right story for them.
A good story keeps the audience focused on what’s happening, while allowing them to subconsciously recognize the underlying the patterns. As a writer it’s important to understand how and why a story works. I will often start with an idea, character, or conflict, and wait until the revision process to try and understand what pattern I’m trying to create, but that is only a preference.