limitieren
to limit
To set a boundary for something; to restrict something in its number, amount, or scope.
Die Teilnehmerzahl für den Workshop ist auf 20 Personen limitiert.
The number of participants for the workshop is limited to 20 people.

to limit
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to limit
To set a boundary for something; to restrict something in its number, amount, or scope.
Die Teilnehmerzahl für den Workshop ist auf 20 Personen limitiert.
The number of participants for the workshop is limited to 20 people.

'Limitieren' (to limit) belongs to the word family of 'das Limit' (the limit). The participle 'limitiert' (limited) is very often used as an adjective to describe a limited edition or quantity.
Diese Sonderedition ist eine limitierte Auflage von nur 100 Stück.
This special edition is a limited edition of only 100 pieces.
The verb 'limitieren' (to limit) is very often used in the passive to express that a limit has been set from the outside. The form is then 'sein + limitiert' (to be + limited).
Der Zugang zum Konzertsaal ist auf 500 Personen limitiert.
Access to the concert hall is limited to 500 people.
When stating the exact limit, you use the preposition 'auf' followed by the number or amount in the accusative. The structure is: etwas auf etwas limitieren (to limit something to something).
Wir müssen die Redezeit auf fünf Minuten pro Person limitieren.
We have to limit the speaking time to five minutes per person.
The reflexive form 'sich limitieren' (to limit oneself) means that you restrict yourself or do not dare to use your full potential.
Mit einer negativen Einstellung limitierst du dich nur selbst.
With a negative attitude, you're only limiting yourself.
to reduce
'reduzieren' and 'limitieren' can both have to do with less or not too much, but they do not mean the same thing. 'reduzieren' means to make an amount, value, or intensity smaller. 'limitieren' means to set a boundary or restrict something. The words can be confused when talking about amounts or costs. The difference is: when something is reduced, it actually becomes less. When something is limited, you say the maximum amount that is allowed or possible. In its reflexive form, 'sich limitieren' also means to set limits for oneself.

Der Veranstalter limitiert die Zahl der Teilnehmer auf fünfzig Personen.
The organizer limits the number of participants to fifty people.
Nach dem Gespräch reduziert die Firma die Zahl der geplanten Überstunden.
After the discussion, the company reduces the number of planned overtime hours.