Russian language is one of the most beautiful languages in the world.  It is nothing if not expressive. The vast ocean of words will let you describe something as simple as a pen in thousand words, allowing to picture this image in your head to a perfection. Just like anything in life you have to start with the basic and in this case to grasp the concept and meaning  behind words and sentences you have to start with grammar. When you start learning it looks unbelievable that you will ever manage to remember all these rules. That's why it will be such a reward when someday you will be reading Pushkin, Dostoyevsky  and many other authors in Russian.

We change pronouns recording to grammatical case, gender, person, singular, plural. There are many groups of pronouns in Russian language, for example - personal pronouns, possessive pronouns, interrogative pronouns, demonstrative pronouns and etc. 

Nouns answer on questions - Кто? (animate)Что? (inanimate). There are six grammatical cases in Russian language (Nominative, Genitive, Dative, Accusative, Instrumental, Prepositional); three genders - masculine, feminine, neuter; plural, singular.

The same as in English, in Russian adjectives describe nouns. Adjectives answer on questions - Какой? and Чей? The gender you are using depends on the gender of a particular noun (pronoun) you are describing, also you are going to use the same grammatical case in which is the noun (pronoun). Also adjectives have comparative, superlative and short form.

There are several rules, regarding to verbs. We would like to emphasize the main points. Verbs answer on questions - Что делать?(Imperfective aspect) Что сделать? (Perfective aspect). There are three tenses in Russian (future, past tense, and present); three grammatical persons; singular, plural; three genders - masculine, neuter, feminine. So, this information we use to conjugate verbs (first conjugation, second conjugation).

Adverbs describe verbs and answer on questions - Куда? Когда? Откуда? Где? Сколько? Почему? Зачем? Как? In many cases adverb is identical with adjective (the short form of neuter). Adverbs in Russian have comparative and superlative form.