The best way to take notes is with a pen and notebook. Keeping your laptop open during class introduces way too much distraction. Sit in any college classroom, you will see a decent number of the people with laptop open browsing facebook.
When you take notes with a pen, don't just write down everything your professor says(a lot of people do that to pretend to be paying attention). Process the information and write down the summary. Write down any question you might have to follow up with TA/professors later.
That said, you can get a Chromebook these days with less than 200 bucks. It easily meets all your classroom needs for college. Just keep it closed during class!