This is the 13363rd most frequent German word.
befestigen
To fasten, secure, or attach.
The verb 'befestigen' is used here to mean attaching or fixing the picture securely to the wall.
Ich befestige das Bild an der Wand.
I attach the picture to the wall.
The verb 'befestigen' here conveys the act of making the hooks stable and capable of holding weight.
Wir müssen die Haken befestigen, damit sie das Gewicht tragen können.
We need to secure the hooks so that they can bear the weight.
In this sentence, 'befestigen' is used to indicate the action of securing the rope firmly to the tree for stability.