The most important tip in the list you have provided above is the one which cautions against purchasing system or indicator. This is because no system or indicator can be put to optimum use unless and otherwise the user has a thorough knowledge of the same. Even simple, common and popular indicators such as RSI, MACD, Stochastic can go a long way in shaping the career of a trader. Thus, it is absolutely unnecessary to spend money on new systems or indicators. Also, it must be remembered that simple trading strategies are very effective than complex ones. This is because, it is easy to apply them without any confusion. Furthermore, it does not take much time to make an appropriate decision. Since trading is all about presence of mind, a simple system and an easy indicator is always the preferred one. Only practice in a demo account will enable a trader to develop a dependable system.