What is the ruling on reading and owning self-help books that contain exercises for skill development?

The negative observations regarding self-help books can be summarized as follows: they act as a drug for purchasing with little practical benefit; many of their authors are disbelievers, which leads to inaccuracies in translation and the presentation of disbelieving symbols; they contain Sharia violations, such as the books "100 Simple Secrets of the Best Half of My Life" and "How to Win Friends and Influence People"; they deviate from religious remedies for anxiety; they carry flashy, deceptive titles to attract money; they rely on purely materialistic theories; and they transform courses into a trade, incorporating neuro-linguistic programming. As for positive observations, they are few in books written by disbelievers. It is recommended to benefit from books by preachers and students of knowledge known for their sound belief and correct methodology.