If there is pressure, then the support in front is relatively large. If there is an upward trend, his pressure is heavier, so it belongs to the resistance level.
If it is a downward trend, then the pressure below is relatively large, so it becomes a support.
Support and resistance interact. You can only go up if there is resistance, but you can't go down if there is pressure. This is the result of the interaction between support and resistance, and it also has a great influence on stock development and stock price rise and fall.