A2 taught you adjective endings after der/die/das and ein/eine. B1 completes the system: when there's NO article at all (plural, or uncountable nouns like coffee or bread), the adjective itself has to do the article's job and show the case clearly — using strong endings.
| Masculine | Feminine | Neuter | Plural | |
|---|---|---|---|---|
| Nominativ | guter Kaffee | frische Milch | kaltes Wasser | frische Eier |
| Akkusativ | guten Kaffee | frische Milch | kaltes Wasser | frische Eier |
| Dativ | gutem Kaffee | frischer Milch | kaltem Wasser | frischen Eiern |
Some adjectives are used as nouns and still take adjective endings: der/die Deutsche (the German person), etwas Neues (something new).
'Ich trinke gern ___ Tee.' (hot, no article, Akkusativ, masculine)