Taking notes is a primary skill which we learn from school. It helps us to rein force the concepts we have learnt. We have probably used notebooks for taking notes.
Now obviously note taking has become more sophisticated. We have online note taking Applications which are linked to the cloud. And since it is in the cloud, the data can be accessed across devices. So even if your laptop crashes, you could still view your notes in your Ipad or even on your phone for that matter. One Note from Microsoft is a popular note taking app available across devices. The data which you write in one device can be accessed from another device.