IMHO, most indicators are one chapter short, the developers write on how they are to be used as they see them, give lengthy examples and often give classes on how to use them. But indicators should be used with Price Action, those that are naysayers perhaps don't see the value are they not spent years finding value. Indicators are not any different than using a trend line, volume, fundamentals or price pattern, they become a rule for a trading plan. Many use Bollingers as trend identifier, others use them to show chop, tightening of price and others to show various forms of retracements. I use them in both day and long term trading for deep retracements, and use them for options to find various standard deviations. Oscillators generally work better in longer term trading for me. If one studies indicators long enough, you can expect them to react in a certain way and when they don't, often times there is a very profitable trade at this point like hidden divergences. I find RSI and MACD work better on weekly especially MACD cause it is slow, way too often traders don't see value is slowness but gives less bad signals and over trading. Also, many traders use indicators wrong, like RSI, when seeking divergences, unless indicator is weighted on highs then another on the lows of price, comparisons should be from close to close. So even the developers get it wrong. Take almost any indicator and go one more chapter. And Price patterns give an indication of price to go a certain direction be it breakout of trend line or a bounce. And some indicators like Fibs are self fulfilling getting a mountain of people buying at 61.8% or selling at 87%, or Gann which takes months to explain it all, just comes down to rules for a trading plan.