The events recorded must be true.

①: Keep track of your physical development and changes. Such as changes in height, weight, bust, vision, etc., from which you can see your physical growth. For example, what happened to the image of myself in the photo when I was 2 or 3 years old and how I look in the mirror now.

②: Keep track of your own learning changes. For example, what parts of the knowledge learned that day are understood and what parts are not understood? This can consolidate and deepen the memory and see the changes and patterns of the knowledge you have mastered.

③: Remember the changes in your life and family. Every family changes every day, a new color TV or mobile phone is added, an old bicycle is sold to a junkyard, or an out-of-town guest comes, etc.