Carefully buy it books

It was quite casual to buy books before. Thanks to the feeling, the book was generous. I want to come and think about it now. It's useless to read a lot of books once.

Now it seems that there is basically no need to buy it books, unless that heavyweight, it will not be easy to get out of date.

1. Most of them in China are left-copied and right-pasted, with no owner. The content is either pieced together or changed from the Internet.

2. Of course, overseas companies are good, at least responsible, but quite a few cannot.ProgramThe current version is updated too quickly. But PDF is enough.

 

Lessons learned, be careful!