Here are 150 "Management Tips of the Day" that have been featured by the Harvard Business Review blog (hbr.org). On average, each has a total word count of about 50 and is best viewed as a reminder rather than as a definitive answer to a business question or a definitive solution to a business problem.
Their primary sources are HBR articles and books published by HBR Press. Therefore, it is correct to assume that these sources are consistently of the highest quality in terms of the information, insights, and advice (usually three specific action steps to take) that are provided by world-class authorities in the given subject area.
The material is organized within three sections, each featuring 50 "tips": Managing Yourself (listed on Pages 195-198), Managing Your Team (198-201), and Managing Your Business (202-205). I include the page references because those who read this brief commentary and have a specific management need (self, team, or business) will need them to locate the most relevant tip(s) by checking out what is available.
I hasten to add that all of the advice is practical, anchored in real-world experience, and of value to almost any manager, whatever her or his given circumstances may be. The "icebergs" to which the title of this review refers are, of course, the aforementioned primary sources. For example:
"Top Ten Ways to Find Joy at Work," Rosabeth Moss Kanter
"Six Ways to Supercharge Your Productivity," Tony Schwartz
"Learn to Embrace the Tension of Diversity," Marshall Goldsmith
"How to Identify Your Enployees' Hidden Talents," Steven DeMaio
"Why Most CEOs Are Bad at Strategy," Roger Martin
"Innovate Like Chris Rock," Peter Sims
I strongly recommend signing up for a free online subscription to the "Management Tips of the Day" series (hbr.org). Each "tip" includes a link to its primary source.