I can't understand about the use of adverb of degree

Adverbs of degree tell us about the intensity or degree of an action, an adjective or another adverb.

Common adverbs of degree:

Almost, nearly, quite, just, too, enough, hardly, scarcely, completely, very, extremely.

Adverbs of degree are usually placed:

1. before the adjective or adverb they are modifying:
   e.g. The water was extremely cold.
2. before the main verb:
   e.g. He was just leaving. She has almost finished.