Can this translate as "What courses"?
Nein. It's 'Which courses?'
Google translate says welche can be translated as which or what (standing for a definite article). Can anyone confirm this?
Welche can stand as 'which' or 'what', but it depends on the sentence. In this sentence, 'what' is wrong.
How can you tell when "Welche" takes the meaning of "what"?