Repetition is a great learning device and a useful literary tool, when used judiciously. Redundancy, on the other hand, is essential in situations where a backup system prevents complete failure, but it should be avoided in your writing.
Engaging prose makes good use of modifiers. Descriptive words—adjectives, adverbs, and phrases—add the kind of detail that draws the reader into a
story or clarifies a piece of nonfiction. But beware the misplaced modifier. Confusion or unintended humor can result when the descriptive word or phrase is placed too far from the word it modifies.