die Grenze
border
The political or geographic line that separates two countries, states, or areas from each other.
An der Grenze mussten wir unsere Pässe zeigen.
At the border, we had to show our passports.

border / limit
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border
The political or geographic line that separates two countries, states, or areas from each other.
An der Grenze mussten wir unsere Pässe zeigen.
At the border, we had to show our passports.

The meaning of 'Grenze' (border/limit) is easy to recognize from context. If it is about countries, geography, or travel, it refers to the geographic line. If it is about behavior, abilities, or abstract ideas, it means a limit.
Wir sind mit dem Auto über die Grenze nach Österreich gefahren.
We drove across the border into Austria by car.
For the geographic border, the prepositions are crucial: 'an der Grenze' (at the border; dative) describes a location, while 'über die Grenze' (across the border; accusative) describes movement.
Das Dorf liegt direkt an der Grenze zur Schweiz.
The village is located right on the border with Switzerland.
In the figurative sense, 'Grenze' (limit/boundary) is often used with verbs such as 'Grenzen setzen' (to set boundaries), 'Grenzen ziehen' (to draw boundaries, in order to define something), or 'Grenzen überschreiten' (to cross boundaries, to behave inappropriately).
Sein Verhalten hat wirklich eine Grenze überschritten.
His behavior really crossed a line.
The idiom 'an seine Grenzen stoßen' (to reach one's limits) means that one's own strength or ability comes to an end. The possessive pronoun ('meine', 'deine', 'seine', etc.) always adapts to the person.
Bei dieser komplizierten Aufgabe stoße ich an meine Grenzen.
With this complicated task, I am reaching my limits.
In the fixed expression 'jemandem Grenzen setzen' (to set boundaries for someone), the person whose behavior is to be restricted is always in the dative.
Der Lehrer musste dem unruhigen Schüler klare Grenzen setzen.
The teacher had to set clear boundaries for the restless student.
end
'das Ende' and 'die Grenze' can both mean a point where something does not continue. 'das Ende' fits when you mean the final point of an object or space, for example the end of a street or a rope. 'die Grenze' refers more to a line that separates two areas, or a limit that should not be crossed. With countries, rules, or possibilities, 'Grenze' is more natural. Learners may confuse the words because a border or limit often feels like an end. But 'Grenze' separates or limits, while 'Ende' simply refers to the final point.

Im Urlaub fahren wir über die Grenze nach Österreich.
On vacation, we drive across the border into Austria.
Am Ende der Straße steht ein kleiner Kiosk.
There is a small kiosk at the end of the street.