This short book is for those managers who want to harm their company's business. They will receive a lot of advice on how to do this. The tips will be concise and practical so that they are easy to follow. For those managers who do not want to harm their business, after reading the material, we ask you to under no circumstances use the actions described in the advice in your practice. All harmful advice is based on the author’s practical experience in the role of a trainer-consultant. The author was able to prevent many business disasters caused by the actions of “managers,” but even more could not be prevented, so that the author could observe the consequences “live.” This allows the author to confidently recommend to you something that will most likely harm your business. Despite the fact that everything written is based on practical experience, all the events described in the book are fictitious and the coincidences with real events are absolutely random and unintentional, although natural. The author of the advice does not bear any responsibility for the destructive consequences of the recommended actions. In the end, he simply spied them “in life.” The book is addressed to managers at all levels: both those who manage the business as a whole, and those who manage the company’s divisions. The publishing design is preserved in pdf A4 format.