Lots of people are citing bad management as a most annoying thihg in tech. I wonder two things: 1) To recognize bad management, there needs to be awareness of

Lots of people are citing bad management as a most annoying thihg in tech. I wonder two things: 1) To recognize bad management, there needs to be awareness of what good management is. What is the common source of that awareness? How do one know good manager from bad one? 2) If good management is so crucial for tech company success, why there is no worldwide trend to help engineering managers become better? There's an awful lot of courses, bootcamps, learning videos, tutorials, git repos and so on for those who wants to be software engineers, but all I see for managers is self-help style books and articles, centered around typical situation "oh, shit, they appointed you to a managerial position, how do you cope with that?"