One is the bollinger band, which is the most commonly used.
Second, the moving average, how many moving average support,
Third, the golden section, judging the support line and resistance line.
The fourth is the candle chart, which is the previous high point and the previous low point.
It's hard to say a few words clearly. I suggest you watch the video. Now there are videos on the Internet to explain the application of technical indicators. Learn these technical indicators mentioned above and you can judge for yourself.