The answer to this question could easily fill a book, so I'll just give a brief overview of some of the most popular technical indicators. One common technical indicator is the moving average. This measures the average price of a security over a given time period. Another common technical indicator is the Relative Strength Index (RSI), which measures the speed and magnitude of price changes over a given time period. There are many other technical indicators, and it's important to experiment with different ones to see which ones work best for you. Ultimately, it's important to use whatever indicators make you feel comfortable trading.