...build [on what you've learned] to explore ideas you're familiar with in more depth.
We imagine that there have been times over the last few years when you’ve sat in a lecture and thought “But we’ve already done this one”. While you might’ve come across concepts and theorists more than once during your undergraduate, try to appreciate the fact that there is probably an unlimited amount of things to say about them/ways to use them in research. Just think about how many books, articles and research papers have been, and still are being, written about the likes of Bourdieu, Freud and many others. Make the most of what you’ve already learnt, and build on it to explore areas you’re familiar with in more depth.
Bear in mind that you’re not just being asked to learn and repeat information; you’re going to have to do all the hard work now – analysing and applying, calculating and criticising.