Any how-to book on trading sold for less than $500 (with lone exception of Thomas N. Bulkowski chart patterns editions) are worthless outside of very general knowledge and amusement. I've bought and read 100s of titles, and cannot think of a single exception other than those noted above.
Hey, you get what you pay for in life, and you get what you don't pay for as well. Too many aspiring traders are led to believe they can scrounge up effective trading tactics, cost-free gleaned from some cheapie books and/or free internet info.
By the time said aspiring traders test out all of that generic fluff in real time with real money, countless thousands $$ have been lost = spent to the markets. Process happens every day, is happening right now this minute, I'm sure.
There are examples in various threads of this forum where traders read a book or were exposed to some trade system / method that they studied for about ten minutes, began trading in real time and let themselves get carved to pieces. What is the true cost of that "free information" when accounts are balanced?
In life, everything comes with a price to pay.
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Books on chart patterns, trend lines, price structure teach the basis of how price action works. There's a helluva lot more to successful trading than that, but understanding price structure is a big start.
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Most worthless book I've read? A lot of obscure titles are about equal, by far the most prominent title in this group being <b>"Reminisces Of A Stock Operator"</b>.
The biography novel of a failed trader who ran the gamut of negative emotions one too many times and hit rock bottom at the end. Nothing in that work for trading tactics is applicable today. Merely a sad saga of what not to do in our profession, entertaining in a morbid way, terrible on the education front.