1. Latin: The Written Language
Adjectives of the First and Second Declension

2. Adjectives of the First and Second Declension
Adjectives of the first two declensions take:
The endings of the first declension when feminine
The endings of the masculine second declension when masculine
The endings of the neuter second declension when neuter
Generally, this means that adjectives of the first two declensions have the same endings as the nouns they modify.
This is not a rule.

3. Adjectives with Occupations
Occupations of the first declension are generally masculine.
This means that adjectives modifying them take the endings of the second declension.