I came across a new term “斩杀线” (Kill Line),

Its true meaning is: when a person's financial situation falls below a certain threshold, they enter an extremely vulnerable state. An accidental injury, a traffic accident, or a minor illness could all potentially lead them to end up on the streets.

Most of us are adults now, so I don't want to talk about any grand principles.
Just want to advise everyone that during each transaction, you must consider how much you might lose, and how long that loss would cover your salary or a few days' living expenses.

Regarding the recent market trend in the crypto world, I keep saying to watch more and act less.
Currently, the market is 99% unpredictable.
If you can't do it, just don't.
Don't always feel like you're missing out; not losing is the same as earning.