
das Heft
notebook
A thin book made of bound paper pages for writing or drawing, often used at school.
Bitte schreib die Vokabeln in dein Heft.
Please write the vocabulary in your notebook.
notebook / issue / handle
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notebook
A thin book made of bound paper pages for writing or drawing, often used at school.
Bitte schreib die Vokabeln in dein Heft.
Please write the vocabulary in your notebook.

issue
A journal or magazine that is published regularly.
Ich habe mir am Kiosk das neueste Heft über Gartengestaltung gekauft.
I bought the latest issue about garden design at the kiosk.

to be in control
To have control or leadership over a situation or matter.
Nach dem Chaos übernahm die neue Managerin schnell das Heft in der Hand.
After the chaos, the new manager quickly took control.

handle
The handle of a tool or weapon, for example of a knife or sword.
Das Messer hatte ein schön verziertes Heft aus Holz.
The knife had a beautifully decorated wooden handle.
The noun 'Heft' is derived from the verb 'heften' (to staple/fasten), which means 'zusammenfügen' (to join together). So a 'Heft' is something in which paper pages are stapled or bound together, which explains its meaning as a school notebook or magazine issue.
Die losen Blätter wurden zu einem Heft zusammengeheftet.
The loose sheets were stapled together into a notebook.
To distinguish between a school notebook and a magazine issue, pay attention to the context. Words like 'Schule' (school), 'schreiben' (to write), or 'Hausaufgaben' (homework) point to a notebook. Words like 'lesen' (to read), 'Kiosk' (kiosk/newsstand), or a topic like 'Mode' (fashion) point to a magazine.
Für den Matheunterricht brauchst du ein kariertes Heft.
You need a squared notebook for math class.
The idiom 'das Heft in der Hand haben' (to be in control) or 'behalten' (to keep control) is a fixed expression. It means to have control or leadership over a situation.
Obwohl die Diskussion chaotisch war, behielt die Moderatorin das Heft in der Hand.
Although the discussion was chaotic, the moderator kept control.
The meaning 'Griff' (handle) is rare and is used almost only in connection with tools or historical weapons. You can recognize it from the context of words like 'Messer' (knife), 'Schwert' (sword), or 'Dolch' (dagger).
Das alte Schwert hatte ein Heft aus reinem Silber.
The old sword had a handle made of pure silver.
number
For a magazine, „Nummer“ can refer to a specific issue in a series and emphasizes its position in that series. „Heft“ refers more to the magazine as a physical publication. If you are specifically looking for issue 8, you say „Nummer“; when reading or holding it, „Heft“ is usually more appropriate.

Das neue Heft des Magazins liegt auf meinem Schreibtisch.
The new issue of the magazine is on my desk.
Für meine Sammlung suche ich noch die Nummer 8 des Magazins.
I am still looking for issue 8 of the magazine for my collection.