Here we have Are book recommendations a good fit for this site? a thread for book recommendations.
I'm pleased that I learned about The Art of Electronics from this question..... book recommendations help fulfill the educational goals of this site and should be allowed or encouraged. Of course, if in future it is observed that book recommendations are causing a problem, I would be happy to revise my opinion on this.
For those who are students/learning new subjects would need some help to have a idea what book would be easy to understand/standard book/the book which is mostly preferred (for instance, The Art of Electronics:Paul Horowitz and Winfield Hill from here). In our EE.SE, we have many experts who can recommend good books for beginners but it is considered as off-topic.
So, I want to know why book recommendations are marked as off-topic?