
an is one of the A2 words in the free course — with this picture, the audio, and spaced repetition.
an
at, on (vertical)
/an/Examples — an in a sentence
Das Bild hängt an der Wand.
The picture hangs on the wall.
Er klebte den Zettel an die Tür.
He stuck the note on the door.
How to remember it
AN sounds like 'ON'. It's simply 'ON' a vertical surface, like a picture ON the wall.