My Five ★ books rating system.

To keep track of my opinions about books I have read. I have established subjective rating system. It looks like this:

First ★
I manged to get trough entire book.

Second ★
There were simple, easy to understand concepts that I found usefully.

Third ★
The book covered complexed and usefully subjects that with some effort I was to comprehend.

Forth ★
It was smart. It was fun. It covered interesting and useful topics.

Fifth ★
It changed my way of thinking. Enlightening. Inspirational.