In english the adjective precedes the noun. So remember that an adjective describes a noun and tells more about it. In english adjectives aren't difficult to form, but in most other languages an adjective is somewhat more difficult to form. Because an adjective usually has to agree with the gender of the noun, meaning that the adjective has a different ending for masculine nouns and feminine nouns. An adjective usually also has to agree with the number of the noun, meaning that there's a special form for plural nouns and for singular nouns.
German adjectives have to agree with the noun in number, gender AND in case.
Meaning that when a noun appears in Nominative case, the adjective also has to appear in Nominative case. Don't worry if you don't yet understand the concept of cases, you'll learn that later. An adjective in german always appears before the noun. And an adjective follows different rules to agree with the noun when there is a definite, indefinite, or no article used.