articles

An article is a word that modifies a noun.

Rules

PLACE
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1. Articles are special modifiers that appear before nouns or noun phrases
2. Articles belong in front of all other modifiers preceding a noun. 
    There are other special modifiers called determiners or markers that may appear in front of a noun phrase.

Do USE.
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1. Rivers, mountain ranges, seas, and oceans should be preceded by the article THE
    
Do NOT use
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1. Do not use an article if you also intend to use any of the following markers directly before the noun: 
    this, that, these, those, my, his, her, your, our, their, its, any, either, each, every, many, few, several, some, all.
2. Do not place an article in front of the names of people.

countable:
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                definite	indefinite
    singular	the         a, an
    plural	    the         Ø    

uncountable:
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                definite	indefinite
    singular	the         Ø

Noun

1. Is the noun countable or uncountable?
    A noun is countable if you can have more than one instance of it
2. Is it singular or plural?
    Am I referring to more than one instance of something?
3. Is it definite or indefinite?  
    A noun is definite when it is clear to your reader which specific instance or instances of an entity you are referring to; 
    otherwise it is indefinite. Often the first use of a noun is indefinite and subsequent uses are definite.

URLs

https://advice.writing.utoronto.ca/english-language/articles/

Determiner

A determiner is a word that is used to modify or introduce the noun in a sentence.

articles: a,an,the
demonstratives: this, that, these, those
possessives: my, your, his, her, its, our, their, whose

quantifiers: all, few, many, any, much, several and some
Distributive: such as ‘every’, ‘each’, ‘either’, ‘neither’, ‘both’, ‘all’, ‘half’, etc.

https://www.englishclub.com/grammar/determiners-order.htm