A and An
Use "a" or "an" the first time you use a noun in a paragraph.
I saw a movie last night.
A man ran into the street.
The
Use "the" the second time you use that same noun in the same paragraph.
I saw a movie last night. The movie was entertaining.
A man ran into the street. A car hit the man.
Normally we do not use the with proper nouns ,
abstract nouns and such nouns as gold , silver
,water, wood, etc. which name materials:
1 - India is a great country.
2- Beauty is admire by all.
3- Gold is very expensive now days .
But when we use these nouns as particular ones ,
we have to use the with them .
1- The Indian
2- The Beauty
3- The Gold