Nouns can have articles in front of them, either definite, or indefinite. Definite articles (e.g. der, die, das) mean
indefinite articles (e.g. ein, eine, ein) mean
The article matches the gender of the noun, and so it is best to learn the definite article when learning the noun so as to remember the gender.
There is a plural definite article (e.g. die), but no plural indefinite article.
Definite articles refer to a specific item or items: the dog, the cat, the bird, the snakes. The definite article must agree in gender with the noun to which it belongs.
In the nominative case, the masculine definite article is der, the feminine is die and the neuter is das. The plural article is die, which looks like the feminine article. Do not confuse them, as they change depending on their grammatical case.
The indefinite article refers to an indefinite or unspecified item: a dog, a cat, a bird. There is no indefinite article for plural nouns. In such cases, no article is provided, and the noun appears alone: snakes, referring to snakes in general.
In the nominative case, the masculine indefinite article is ein, the feminine is eine, and the neuter is ein. The masculine and neuter articles are the same in the nominative, dative and genitive, but differ in the accusative. Do not confuse them.
There are plenty of possessive forms to learn - including their case endings. However, the good news is that the possessive form of ihr (her) and ihr (their) is absolutely identical. The same is true for Ihr (their [polite form]), with the only minor change that the first letter of the pronoun is always capitalized, i.e. Ihr, Ihre etc. We have higlighted these sections for you to make it easier to identify them.