I sometimes wrote a summary of Books I've read. In the past I didn't write except for studying something. Reading a book helps me to solve the Problem and understand something i didn't know well. As soon as i read a book . I write Summary of book and i sometimes read it. It's similar to read a book again. I can save the time and understand well. I also posted it in my blog. I can see it anywhere. Writing of summary also helps me work well. Nowadays i often write a report to my boss. Since when i write a report, people say that it is good to understand . In the future i would like to read a book of