At 2 a.m., my phone buzzed so hard it almost fell off the nightstand. The group chat was in chaos. Old Chen sent a string of voice messages, his voice trembling: "It's over, my wife made a mistake, all three million for our kid's overseas studies is gone..."

I didn't reply right away. I first asked, "How did you store the mnemonic phrase? On your phone or computer?" There was a long silence, then an even more devastated voice came through—Turns out, before going on a business trip, Old Chen was worried his wife wouldn't know how to use the wallet, so he took a screenshot of the 12-word mnemonic phrase, annotated it, bundled it up, and sent it to the family group chat, along with a detailed tutorial video. As a result, during a transfer at dawn, the assets were split into 7 transactions and completely drained. The platform's customer service just said, "User-initiated operation, can't be recovered."

I've been in this industry for six years, and I've seen tragedies like this more than twenty times. So many people stare at coin price charts without blinking, yet are dangerously careless about basic security. Today, I'm laying out three ironclad rules that every beginner must remember—these are more effective than any technical analysis.

**Rule #1: Your mnemonic phrase must be physically isolated; putting it on any electronic device is like giving away your money**

The mnemonic phrase is the master key to your assets. Imagine locking three million in a safe, then posting a photo of the key on social media—doesn't that sound stupid? Yet, in reality, some people store their mnemonic in their phone notes, and after losing their phone, $2.6 million is wiped out within 24 hours. Others use cloud notes, and if the account gets hacked, their assets instantly go to zero.

Industry statistics are brutal: last year, 73% of asset theft cases were due to digital storage of mnemonic phrases. Phones, computers, the cloud—these places you think are "convenient"...