Modifiers should be placed close to the words they describe to avoid confusion. Correct: 'The big dog barked.' Incorrect: 'The dog big barked.'
Pro Tip 2/3
Misplaced Modifiers
A modifier placed incorrectly can change the meaning of a sentence, often humorously. 'Eating ice cream, the sun was too hot' implies the sun is eating ice cream.
Pro Tip 3/3
Dangling Modifiers
Modifiers must clearly refer to a specific word, or they will dangle, causing confusion. Incorrect: 'Running fast, the view was blurry.' Who is running?