In storytelling, the primary principles of plot include goal, antagonist, conflict, and consequences. You can't have a great plot without those elements first. The secondary principles of plot build directly off the primary, and they include progress, setbacks, costs, and turning points. As you likely guessed, the tertiary principles build off the prior two sets, and they include plans, gaps, and crises.
Here is a very brief review of what we've covered so far.
Goal--the protagonist has a want that manifests in a concrete goal. (There are different types of goals and the goal may change, but a goal is necessary to create context for the plot.)
Antagonist--the antagonistic force is a form of opposition; and thus it is something in the way of the goal. (While there is often a primary antagonist, most stories will have multiple--and even temporary--antagonistic forces)
Conflict--because the protagonist and antagonist "want" opposing things (to some degree), this leads to conflict.
Consequences--conflict only really matters when it carries consequences. This gives a plot a sense of cause and effect. Stakes appear as potential consequences. Ramifications appear as consequences that actually happen.
Progress--progress is used to measure how close the protagonist is to getting the goal. A sense of progress comes from reaching smaller goals within the larger goal.
Setbacks--setbacks happen when an antagonistic force blocks or pushes back the protagonist from his or her goal. They work as the opposite of progress.
Costs--when the protagonist moves forward and comes into conflict, there is often a sort of cost. This may be their physical or mental well-being, time, money, or any other sort of resource. Costs put responsibility and accountability on the protagonist as they exercise agency.
Turning Points--turning points appear as an action (event) or a revelation (information) that changes the cause-and-effect trajectory of the story (consequences). The plot was going one direction, but a turning point shifts it onto a new path.