Most writing experts favor a particular way of looking at plot, and will adhere to it for years or an entire career. Thats all well and good, but its important to realize that any way of modeling story is just thata model, not the depths and living essence of story itself.
Problems arise when young (or experienced!) writers mistake a simplified structure for some deep and eternal truth. Its much better to examine several structures, see what their strengths and weaknesses are, and try to glimpse the truth they are trying to convey.
The actual truth of story is beyond any structure, but they all point in the same direction, toward that misty, hidden metaphorical mountain all storytellers have been climbing since the beginning of time. As long as we dont mistake the finger for the mountain, the structures can be quite useful indeed.
The worst story model that is at all useful might be It has a beginning, middle, and an end. Well, yes, but so does a piece of string.
More helpfully, try: Objective, Obstacle, Outcome. In other words, a character wants something, and something stands in her way. She tries various things to resolve the difficulty, leading...