Oxford was not a university until the 13th century.

There were teachers (masters) in the vicinity at various earlier points, but no official organization or formal classes/courses of study. What they lectured about would be up to them. Later on, English universities would be known for their arts (logic, rhetoric, grammar, and then mathematics and natural philosophy) and theology courses of study.

But that was fine--there wasn't really a need for the sorts of formal courses of study, like the license to preach (for, well, preachers). Education until the late 12th century was mostly about preparation for an ecclesiastical career, though gradually more and more students found work in the growing secular bureaucracies. (England papered up earlier than many other national governments, too). Into the first century of formal university foundations, all students had to be in at least minor clerical orders--acolytes, deacons, and so forth. (Ordination as a priest was not required--that's a higher order). Students needed money to support themselves. Generally this would be from a parent, but in some cases there were parishes or cathedrals that sponsored a student's benefice to study. But don't get a sense that this was all that egalitarian--Latin knowledge was a basic prerequisite of "higher" education, which meant previous access to a monastic or cathedral-grammar school.