Is there a Holy Grail in investment trading? Is there a method that can consistently yield profits?

I've seen many people online discussing various methods and indicators, such as the BOLL Bollinger Bands, but some say that breaking through the upper Bollinger Band indicates the formation of a trend, and one should chase it, while others say that touching the upper Bollinger Band means that the short-term price divergence momentum is weakening and needs adjustment. Which one is correct?

$BTC