
bebauen
to build on
To construct buildings on a plot of land or an area.
Die Gemeinde plant, das freie Feld am Ortsrand zu bebauen.
The municipality plans to build on the open field at the edge of town.
to build on / to cultivate
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to build on
To construct buildings on a plot of land or an area.
Die Gemeinde plant, das freie Feld am Ortsrand zu bebauen.
The municipality plans to build on the open field at the edge of town.

to cultivate
To use land agriculturally by growing plants.
Der Bauer bebaut seine Felder jedes Jahr mit Mais und Weizen.
The farmer cultivates his fields with corn and wheat every year.
The verb 'bebauen' has the inseparable prefix 'be-'. This prefix turns the verb 'bauen' (to build) into a transitive verb that refers directly to an object, namely the area on which something is built or grown.
Die Stadt möchte das gesamte Ufer neu bebauen.
The city wants to redevelop the entire riverbank.
'Bebauen' always needs an accusative object. This object is the area being worked on, for example a plot of land, a field, or farmland.
Der Landwirt bebaut den Acker hinter seinem Haus.
The farmer cultivates the field behind his house.
You can tell from the context whether 'bebauen' means 'Gebäude errichten' (to construct buildings) or 'Pflanzen anbauen' (to grow plants). If it is about architecture, cities, or plots of land, the first meaning is intended. If it is about agriculture, fields, or plants, the second is intended.
Dieses Gebiet darf nicht bebaut werden, da es ein Naturschutzgebiet ist.
This area may not be built on because it is a nature reserve.
In the agricultural meaning, the preposition 'mit' (with) is often used to say which plants are being grown. The plant is then in the dative.
Dieses Jahr bebauen wir das Feld mit Sonnenblumen.
This year we are cultivating the field with sunflowers.
to build
Bauen focuses on the building being created or on the construction activity. Bebauen focuses on the plot of land or area where buildings are being built; this area directly serves as the object. That is why you build a house, but you bebauen a plot of land.

Die Familie bebaut das Grundstück mit einem Haus.
The family is building a house on the plot of land.
Die Familie baut auf dem Grundstück ein Haus.
The family is building a house on the plot of land.