I like to write Task List (or To do List), as it helps me to recall what is the next thing to do and what has been done. By completing the tasks, makes me feel satisfied as it shows the growth or development of my life (and daily life). By using tasks list, I will not wandering around too much, as I remember what to do next.

There are two Task List apps which I found nice: Wunderlist and Any.do. Both are available on Android and Chrome extensions. Both can perform synchronization (as most of the apps should able to do).