1. Form and meaning
German capitalises adjectives when they are used as nouns: der Arbeitslose, etwas Interessantes, nichts Neues. Their endings depend on the surrounding grammar. Indefinite pronouns such as jemand, niemand, alle, einige and andere help refer to people or things without naming them precisely.
When you study this pattern, identify its communicative purpose first. Then check the verb form, case and word order. German clauses are easier to control when you learn the connector together with the sentence pattern it requires.