It would be better if you write all the things in your language in this post instead of referring to other sites. I am saying this because I see your post history, many times you posted the same way, title,a subtitle in the post description then a link of the full articles. It's a very poor habit IMO. So if you really want to give some effort to this community learn from this forum or other source and share in this forum if it already not done.(don't copy paste from other source without reference)