Technical Indicators are set of price data points connected together. There are over 100+ indicators in technical analysis. However, few most popular are RSI, Stochastic, Moving Average, supertrend, bollinger band, VWAP, and MACD.
Problem with technical indicator is they give signal after price moves significantly. Also, due to price making by market makers and news, they give lot of fake signals. So, it is advised that a technical indicator should not be used alone.
A good technical analysis online course would cover the depth point of market which help to increase your accuracy and consistency in the market. .