First of all, determine the cost components that you are familiar with, because there are many components. But since you want to write, you should write what you are most familiar with, so that you can be like a duck to water. Determine what you want to rewrite. Marketing, manufacturing or distribution. .

Then, based on a certain category, the links and processes of this category are analyzed in detail, so as to better find the strategy of controlling costs. The benefits from this.

This is just my opinion. . .