This screenshot is a K-line chart, divided into 1 minute chart, 5-minute chart ... daily chart, weekly chart ... annual chart and so on. Here is a daily chart that everyone often looks at.

The red line indicates that the closing price of the day is higher than the opening price;

The green line indicates that the closing price of the day is lower than the opening price.

We can't subjectively conclude that the red line represents the stock price rise that day, because it may be low and high; The green line is not necessarily a stock price decline, but may be a gap.

And look at the k-line chart in combination with the moving average.