It is called stochastics in foreign countries and KD in China, which means that there are fewer J lines than KDJ.

Generally speaking, technical indicators are divided into:

Trend index, trend intensity index, swing index, vibration index, channel and price index.

Everyone has different personality, different habits, different understanding of trends and different indicators.

Some people like short-term, some people like band, and some experts can get 1 year with one hand, hehe.

Finding the right one is the best indicator.

Personal understanding, for reference only.