Yup similar to above, I only add extra information on the lecture slides since there's no point in copying down what's already in the slides.
Usually, I would download the powerpoint slides beforehand and then edit/add onto them directly during the lecture itself. The kind of information I add would be extra explanations, tips or examples said by the lecturer. I find this method pretty effective as it forces me to pay full attention to every single minute. Then whenever I find time, I collate the annotated lecture slides + textbooks + other prescribed readings into a detailed set of notes for that week (done handwritten, though some may prefer creating typed notes - do whichever works best for you).
Hope this helps.