If you truly want to "know" about deriving pattern-discerning traces from market data (an activity that has the unfortunate, and entirely inapt title of "technical analysis"), then
• forget all of the known books entirely,
• get yourself an accurate breakdown of the formulae for Appel's MACD and Wilder's ADX, and
• compute them for yourself.
It's not that hard. All "T/A" tools contain mathematical variations of the MACD or the ADX, whether those tools were derived before them or after. Each requires some degree of parameter-specifying that is mostly arbitrary. Repetition in mathematical form makes a laughing stock of people who use the phrase "was confirmed by" in a T/A comparison statement -- e.g., "The rising-market trigger of the RSI
was confirmed by the Lane's Stochastic on the very next candle." Holy Multicollinearity, Batman.

Lastly,
what you are doing is only creating a trace, of a past market pattern, defining a range of behavior which the market is free to break at any time. "Playing the percentage" is fine, just keep your stops in place.
Sermon over.
