
begrenzen
to border / bound
To define or form a spatial or physical boundary for something.
Eine hohe Mauer begrenzt das Grundstück zur Straße hin.
A high wall borders the property on the street side.
to limit / border
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to border / bound
To define or form a spatial or physical boundary for something.
Eine hohe Mauer begrenzt das Grundstück zur Straße hin.
A high wall borders the property on the street side.

to limit
To restrict or limit the scope, amount, or duration of something.
Wir müssen die Redezeit auf fünf Minuten pro Person begrenzen.
We have to limit speaking time to five minutes per person.

to limit oneself to
To deliberately restrict oneself to a particular thing, topic, or activity.
In meinem Vortrag werde ich mich auf die wichtigsten Ergebnisse begrenzen.
In my presentation, I will limit myself to the most important results.
'Begrenzen' (to limit/border) is derived from the noun 'die Grenze' (border/boundary). The prefix 'be-' makes it an inseparable verb that describes an action: setting a boundary.
Der Fluss bildet die natürliche Grenze zwischen den beiden Ländern.
The river forms the natural border between the two countries.
In its abstract meaning, 'begrenzen' (to limit) is often used for non-physical things. Typical combinations are: limit costs, time, speed, choices, or the number of participants.
Die Firma muss ihre Ausgaben für das nächste Quartal begrenzen.
The company has to limit its expenses for the next quarter.
The reflexive form 'sich begrenzen auf' (to limit oneself to) has a fixed structure. It always uses the preposition 'auf' followed by the accusative and means that you deliberately focus on or restrict yourself to something.
Ich begrenze mich in meiner Präsentation auf die wichtigsten Fakten.
In my presentation, I am limiting myself to the most important facts.
to limit / restrict
Both words can express that the scope, amount, or duration becomes smaller. “Begrenzen” emphasizes setting an outer limit, such as a maximum number. “Beschränken” places more emphasis on restricting use or the scope for action. Use “begrenzen” for a limit and “beschränken” when there are fewer possibilities.

Die Stadt begrenzt die Zahl der Besucher auf fünfhundert.
The city is limiting the number of visitors to five hundred.
Die neue Regel beschränkt die Nutzung des Parks auf wenige Stunden.
The new rule restricts use of the park to just a few hours.