The difference between "usage" and "use " in English language

Usage: rules of language Use: meaningful communicative behaviour 

The term usage refers to conventions, most often to those of language. Thus, 'English usage' or 'French usage' refers to the conventions of those languages, respectively. When we refer to 'word usage', we mean the conventions for using words; when we refer to 'use of words', we mean only the employment of words . for example

It is not correct to say that "the wise usage of computers saved the company money.

In this instance the word use is appropriate.,