die Halle
hall
A very large, covered room or building used for events, sports, production, or storage.
Das Basketballspiel findet in der neuen Sporthalle statt.
The basketball game is taking place in the new sports hall.

hall
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hall
A very large, covered room or building used for events, sports, production, or storage.
Das Basketballspiel findet in der neuen Sporthalle statt.
The basketball game is taking place in the new sports hall.

The word 'Halle' (hall) is very often the second part of a compound noun. The first part then describes the purpose of the hall.
Die Züge fahren von der großen Bahnhofshalle ab.
The trains depart from the large station concourse.
Pay attention to the case after the preposition 'in'. Movement into a hall is expressed with the accusative ('in die Halle'), while a fixed location inside it requires the dative ('in der Halle').
Die Sportler gehen in die Halle, um zu trainieren.
The athletes go into the hall to train.
A 'Halle' (hall) always refers to a large, spacious, and open room. The word is not used for a narrow corridor or hallway in an apartment.
Die alte Fabrikhalle wird jetzt für Kunstausstellungen genutzt.
The old factory hall is now used for art exhibitions.
stadium
'die Halle' and 'das Stadion' can both be large places for sports, concerts, or events. The important difference is: a 'Halle' is covered and often a large indoor space. A 'Stadion' is a large sports facility with stands, usually open or only partly covered. So you are more likely to say 'Sporthalle' (sports hall) when the game takes place indoors, and 'Stadion' when talking about football, athletics, or a large concert with many spectator seats. The words can be confused because both are large and can have an audience.

Wegen des Regens findet das Training heute in der Halle statt.
Because of the rain, training is taking place in the hall today.
Im Sommer gingen wir ins Stadion, um das Fußballspiel zu sehen.
In the summer, we went to the stadium to watch the football match.