
der Stoff
fabric
A textile fabric or material used to make clothing, curtains, and other things.
Dieser Stoff fühlt sich sehr weich an und eignet sich gut für ein Sommerkleid.
This fabric feels very soft and is well suited for a summer dress.
fabric / material
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fabric
A textile fabric or material used to make clothing, curtains, and other things.
Dieser Stoff fühlt sich sehr weich an und eignet sich gut für ein Sommerkleid.
This fabric feels very soft and is well suited for a summer dress.

material
The topic or content covered at school, university, or in a course; the learning material.
Wir müssen für die Prüfung den ganzen Stoff des letzten Semesters wiederholen.
We have to review all the material from last semester for the exam.

substance
A substance or matter with specific chemical or physical properties.
Plastik ist ein künstlicher Stoff, der aus Erdöl hergestellt wird.
Plastic is an artificial substance made from petroleum.

material
The subject matter or material that serves as the basis for a story, film, or work of art.
Die griechische Mythologie lieferte den Stoff für viele berühmte Opern.
Greek mythology provided the material for many famous operas.

stuff
A colloquial, general term for illegal drugs.
Er wurde erwischt, als er auf dem Schulhof Stoff verkaufte.
He was caught selling stuff in the schoolyard.
'Stoff' has many meanings, but they are usually clear from context. Words like 'nähen' (to sew) or 'Kleid' (dress) point to textiles. 'Lernen' (learning) or 'Prüfung' (exam) point to school material. 'Chemie' (chemistry) or 'Substanz' (substance) point to matter.
Ich habe mir einen schönen Stoff für ein neues Hemd gekauft.
I bought a nice fabric for a new shirt.
The plural 'die Stoffe' is used for textiles and chemical substances. For learning material at school or university, however, the singular 'der Stoff' is almost always used, even when many topics are involved.
Im Labor experimentieren wir mit gefährlichen Stoffen.
In the lab, we experiment with dangerous substances.
When 'Stoff' means a textile, it is often combined with verbs like 'kaufen' (to buy), 'zuschneiden' (to cut to size), and 'nähen' (to sew), or adjectives like 'weich' (soft), 'bunt' (colorful), or 'gemustert' (patterned).
Für die Vorhänge brauchen wir einen schweren, dunklen Stoff.
For the curtains, we need a heavy, dark fabric.
In a learning context, 'Stoff' is what you need to know. Typical phrases are 'den Stoff wiederholen' (to review the material), 'den Stoff beherrschen' (to master the material), or 'den Stoff durchnehmen' (to cover/go through the material).
Vor der Prüfung sollten wir den ganzen Stoff noch einmal durchnehmen.
Before the exam, we should go through all the material once more.
When 'Stoff' means the subject matter of a work of art, words from the field of culture often appear. Watch for phrases like 'der Stoff für einen Roman' (the material for a novel), 'ein historischer Stoff' (a historical subject), or 'Stoff für einen Film bieten' (to provide material for a film).
Sein Leben bot genug Stoff für einen spannenden Abenteuerfilm.
His life provided enough material for an exciting adventure film.
Careful: In colloquial speech, 'Stoff' is a widespread term for illegal drugs. This meaning is limited to informal contexts.
Die Polizei ermittelt gegen eine Bande, die mit Stoff handelt.
The police are investigating a gang that deals in stuff.
topic / theme
In a film or story, Thema refers to the central idea being explored. Stoff, on the other hand, is the narrative material that serves as the basis for the work. A historical event can therefore provide the Stoff, while the film uses it to explore a more general Thema.

Den Stoff für den Film liefert die Geschichte zweier Freunde im Krieg.
The story of two friends during the war provides the material for the film.
Das Thema des Films ist der Konflikt zwischen Freundschaft und Pflicht.
The theme of the film is the conflict between friendship and duty.