Modifiers restrict or enhance the meaning of a noun, for example, accurate and efficient in accurate, efficient supply planning.
Avoid dangling modifiers, which modify a word or phrase that's not clearly stated within a sentence.
When you design your app, link modules with pages to support your end-to-end process.
When designing your app, your end-to-end process is supported (by zombies) by linking modules with pages.
In the second example, designing is the modifier, but the word it modifies (you) is absent. As a result, the content suggests that it's the end-to-end process that designs the app. (It’s also in the passive voice, which you should try to avoid.)