Lecture material is just a starting point for the topic discussed. It’s to give you the general overview, methods/theories and examples for you to move forward with your academic research. I would suggest splitting your page into 3, having key quotations the lecturer has referenced, the methods and theories and at the bottom your conclusion/takeaway. The next stage is the most crucial, your own academic reading and research usually prepared for your seminars. There should be a reading list created by your lecturer for each lecture to coincide with the seminar - to understand the topic better read through the recommend reading material and from there you will understand the topic better. Hope this helps!