The most painful lesson I've learned in the past two years is a simple truth: don't hold a position so large that it keeps you awake at night.

If you can't hold spot, it's mostly not because you don't believe, but because you bought too heavily—when it rises a bit, you want to take profits; when it drops a little, you panic and cut.
Futures are even more direct; leverage kicks in, and the volatility makes decisions for you.
In the end, it's not you stopping the loss, but being liquidated—"helping" you to stop the loss.

My current guiding principle is very basic: first, think clearly about the "worst-case scenario"—if this position gets cut in half, can I pretend it never happened?
If not, then reduce.
For futures, after being educated three times, I basically only leave a very small margin; if I lose it all, I consider it tuition, and don't expect to turn things around in one shot.

Recently, meme and celebrity shout-outs that cause attention shifts across the entire internet—basically, it's about seeing who can take the final baton.
Newcomers really shouldn't rush; taking it slow actually makes it easier to survive.
That's all for now.