I'm sorry, I just assumed all knew what Cornell notes are
Well, it's just another way of taking notes. In this, you draw a margin on the left, after the red line about 1-2" wide. In that margin you right the key word and on the right you write the corresponding details. At the end of the paper you summarize in about 2 lines.
For instance, you could write MI
on the left and on the right you write what MI is. Next you could write the results
of MIs and on the right you write rupture of plaque, thrombosis etc etc.
Also, you could draw pictures, mnemonics what ever it takes to let the info stick in your brain.
It is a good idea to write the page # of the text from which you got the info. That way, you can easily refer.