Technical indicators
RSI, moving averages, MACD and their limits.
Indicators are formulas computed from past prices and volumes. They do not see the future; they only show the past in a different way.
RSI shows the speed and strength of price changes on a 0–100 scale. Moving averages smooth the price but lag. MACD is the difference between two exponential averages.
Several indicators built on the same prices often duplicate each other instead of giving independent confirmation.