Dos and Don'ts
I have a daily note that I use to capture tasks, reminders, and ideas throughout the day. At the top of every note is my do and don't list. I look at this every day to help me become the person I want to be.
I got this idea from Jack Dorsey and it has been very influential on my life. Here's the talk (it's worth watching the whole thing).
Obviously I'm not perfect. There are days and weeks where I fail to live up to the ideals of this list. But it's a helpful reminder of the simple actions that I know I can take to be a better man.