投資學是一門暨深且廣的學問，其不僅牽涉到理論，還涉及到實務。就其理論面，不僅有CAPM、APT、EMH等學術理論，有些投資大師也有不同的見解。如投資巨鱷索羅斯(George Soros)就自創反射理論( The Theory Of Reflexivity)；巴菲特(Warren Buffett) 則奉行價值投資，在基本面未變化之前，採取長抱策略( Buy & Hold)。另一位投資大師(Tiger Hedge Fund 的創辦人)-Julian Robertson則是兼具市場不效率及基本面兩種假說，而以" 一個投機者的告白 " 聲名大噪的歐洲股神安德烈˙科斯托蘭尼(Andre Kostolany) 則奉行在市場無效率假說，他的座右銘是 [我是投機人士，而且如終如一]。而國內近幾年來坊間也開始有些投資素人(指非我們一般所說的投資專家)的投資秘笈付梓，如張松允的[從二十萬至十億]，陳進郎的 [股市大贏K線寫日記]；東山的 [股市絕學],蘇松泙的[不蝕本投資術]……等等，不一而足。
不過不論他們用什麼方式，他們在股海裡都是滿載而歸的。所以不同的理論，不同的做法，只要運用得宜應都能從股市獲利。

Investment is knowledge of depth and breadth; it is not only about theories, but also practices. In addition to the various theories developed by the academic world, such as CAPM, APT, and EMH, there are also theories developed by investment gurus. For example, George Soros framed “The Theory of Reflexivity”. Warren Buffett believes in “Value Investing” as well as “Buy & Hold”and created respective investment strategies. Julian Robertson, founder of Tiger Hedge Fund, believes that both, fundamental research and market inefficiency, open opportunities to abnormal returns.Andre Kostolany, author of “Confessions of a Speculator”,was also convinced thatmarkets are inefficient.One of Kostolany’s famous quotes is “I am a speculator, and have always been”.
In Taiwan, some investors, which should be differentiated them from the ordinary investment professionals because of their outstanding performance, also published their secrets of investment. To name a few, the “From 200 Thousands NT Dollars to 1 Billion NT Dollars” by SONG-YUN ZHANG, the “Big Winner in Stock Market - Write Diary with Candlestick Charts” by JIN-LANG CHEN, “Stock Market Strategy” by DONG-SHAN, the “No-loss Investment” by SONG-PIAN SU, and etc..
Regardless of what methodologyis used, they were all winners in the stock market. Looking at all these different theories and practices, every single one could be applied to make money from trading in stock markets, given that they are used properly.

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