Conversation so far:
Did Abdurrahman Wahid teach oversees?
What did Abdurrahman Wahid teach?
In 1974, he found extra employment in Jombang as a Muslim Legal Studies teacher at Pesantren Tambakberas and soon developed a good reputation.
Why was Abdurrahman Wahid displeased at the method of education used by the Al Azhar University in Cairo, Egypt?
He was disappointed as he had already studied many of the texts offered at the Institute in Java and disapproved of the rote learning method used by the University.
Is there anything else noteworthy regarding Abdurrahman Wahid besides displeasure over the method of education at Al Azhar University?
He sought and received another scholarship at the University of Baghdad and moved to Iraq.

Question: What did he study?
Self-contained rewrite: What did Abdurrahman Wahid study at the University of Baghdad?