One of the tools I use the most is harmonics: intervals repeating themselves. Not necessarily lasting the same period, but the movement is the same before a countermove comes into play.
What I like about harmonics is how simple it is. The price depends on traders taking positions based on thousands and thousands of combinations of indicaters and fundamentals and STILL these harmonics work. Not ALL the time but they are definitely worth consider in your analysis.
This is an example from USDCAD.
All lines of the same color are identical.
Obs. Harmonics are sometimes referred to as AB=CD