As you have opined, trading strategy should always be an outcome of a trader's personal experience. It should never be copied. If so, in case of a loss there is no possibility to assess the reason for the same. Only when a trader develops by himself, an all inclusive system that clearly defines entry, exit, stop loss and take profit price, there is a possibility to fix errors or fine tune the same. The development of trading strategy begins after having a reasonable trading experience on a demo account. This would allow us to understand where we need to enter or exit in a fast moving market. By adding sufficient risk and money management components, a strategy can be perfectly fixed.