I once believed that it was worth reading as widely as possible when it comes to finance and investment, but with the mushrooming of information now available have come around to the view that some opinions and commentators are so crass in their posturing that quality must beat quantity.
1 - Resources 'gurus'
Despite working the resources sector for years, I did so myself, with the mining investment boom running for at least a year longer than I had expected, in part due to monumental cost overruns on Gorgon LNG and other similar mega-projects. No matter, the mining investment boom phase is officially over, and - as it always eventually must - now follows the bust.
2 - Fads
3 - Perma-bears and pessimists
4 - Theorists
5 - "Specific general advice"
6 - Narcissists
7 - Bullies
8 - Vested interests
Being a Chartered Accountant, I naturally enjoyed the mathematical or numbers-based focus to the book, particularly the demonstration of how the internal rate of return or "IRR" on a property investment could remain remarkably similar in times of lower interest rates and lower inflation.
This excellent book took many of the fundamental principles from Jan Somers' classic and codified them in a way that can be used practically by both beginners and advanced investors alike in the 21st century. I have found it to be a quality user manual for creating wealth through property investment.
You still could follow a very similar plan today, though I do note that you would likely struggle on the value investing front with stocks globally trading at increasingly stretched forward PEs - beginners way be wiser to adopt a more conservative averaging strategy today, since value has now become harder to find.
Whatevs...I reckon it's better to be lucky than smart, although eventually becoming both would be a nice goal.