One of the first things to learn is time management is to write things down - even if you have a good memory. Scientific research showed that we remember much more things when we write them down. According to Baddeley’s model of working memory our memory consists of a phonological loop, a visual and an episodic loop. These loops represent short time memory and it seems that they reinforce each other. This means that the probability to remember something is much higher if you write it down - even if you don’t need the notes later.
The second reason for taking notes is that you free your mind. Permanently reminding yourself that you don’t have to forget this or that simply causes stress. Once you wrote down all items you can focus your mind on achieving the task you are currently working on.
I therefore recommend having a note pad with you where you takes meeting notes, reminders or where you can do brainstorming. Taking it with allows you to also turn idle time into productive time - regardless where you are . Although I am a large fan of electronic devices I believe that there is no alternative to having an A4 note pad, so that you are quick and also have sufficient space. On top of the paper you might also use an electronic help such as evernote in case you travel a lot. It allows you to take quick notes by voice, picture or text through your mobile phone and automatically synchronizes it with you PC at work or at home.
It is absolutely mandatory that you plan a fixed time to review your notes once a day. The best time to do this is when you plan your day. During this time you transfer tasks into your to-do list, update your calendar and schedule other activities related to your notes.