This is the 89th most frequent German word.
sollen
"To be supposed to" or "should."
In this sentence, 'sollen' is used to express an obligation or a duty prescribed to the speaker.
Ich soll meine Hausaufgaben bis heute Abend fertig machen.
I am supposed to finish my homework by this evening.
Here, 'sollen' is used in a question to ask for advice or a suggestion.
Was soll ich tun, wenn ich diesen Fehler sehe?
What should I do when I see this error?
In this context, 'sollen' is used in its subjunctive form ('sollte') to express a recommendation or advice.