Learn Russian: Балет очень красивый.

In Russian, the verb "to be" is almost never used in the present tense. Instead of saying "is" or "are," you just put the subject (балет) and its description (очень красивый) side by side.

How can I tell that балет is a masculine noun?

You can usually tell a Russian noun's gender by looking at its last letter. Since балет ends in a hard consonant (the letter т), it is a masculine noun.

Why does красивый end in -ый?

Adjectives in Russian have to match the gender of the noun they describe. Because балет is masculine, the adjective must take the standard masculine ending -ый.

Does the word очень change depending on the gender of the noun?

No, очень (very) is an adverb, which means its form is frozen. It never changes its ending, regardless of whether the noun is masculine, feminine, or neuter.