Grammar rule for using an article with the verb form: USE

Neeta,

It seems that you are looking for an explanation of the definite article 'the'.

There are a few simple rules for knowing when to use the definite article and a few more rules for knowing when not to. (Keep in mind there are a lot of exceptions and special rules that would fill a page, these you should study as well and you can find explanations here.)

Use the definite article when:

-- the noun it precedes is unique;

"She is the new President."

-- the noun it precedes is followed by a description or some sort (ask the question: which?);

"This is the handbook that I used last year." (Which handbook? The one I used last year.)

"The use of the voice mail system is encouraged." (Which use? The use of the voice mail system.)

-- you know which specific thing you are referring to based on context;

"There is a cat on the fence. The cat jumped off the fence."

-- you are talking about a specific place that is known based on context;

"I'll meet you in front of the school at 7 p.m."

-- you use a superlative.

"He is the best singer in the country."

"Blueberries are the healthiest food here."

Do not use the definite article when:

-- the noun following is a general plural noun;

"Gold medal winners are great athletes."

"Some people think Ford trucks are better than Chevrolet trucks."

-- you're referring to an institution rather than a specific location.

"Finishing school is very important." (Other words that are commonly confused are university, prison, and hospital, though in American English we always say 'the hospital'.)

IN YOUR EXAMPLES, I would say that both should use 'the'.  However, many nouns can be written with or without the article.  Your example is correct as either "the correct usage of Affect and Effect" or "correct usage of Affect and Effect".  But, if you follow the rules you won't be wrong.

If anybody else has some helpful rules, please post them!