daarom means “that's why / therefore”. When it opens the clause, the verb comes before the subject (inversion).
Connective adverbs · Bijwoorden
Ik ben ziek. Daarom blijf ik thuis.
I'm sick. That's why I'm staying home.
Het was druk, daarom kwam ik te laat.
It was busy, so that's why I was late.
Drag scrambled words into the right Dutch order and master inversion and the verb-final rule.