🤷 don't keep much money there has always seemed like good enough advice, but not for everyone

No system is immune. The difference is that hardware and mobile wallets have different attack surfaces. The Coldcard discussion is about a very specific attack scenario. It doesn't automatically mean mobile wallets are more or less vulnerable, just vulnerable in different ways I believe.

Any amount that would devastate you if you lost it should be kept on a hardware wallet where you use dice or something similar to generate the first 23 words. Then you type them in and let the hardware wallet generate the last word. Otherwise if you rely on electronics to generate randomness for you you are taking a risk with your funds. There are guides for this online. Each person has to decide for themselves at what point an amount of money becomes significant.

If you would've asked the likely hood of a cold card attack 3 days ago most people would've said your funds are 100 percent secure. We dont know what we dont. Your best bet going forward is probably make your own keys. Not your entropy not your keys. Had those cold cards made there own keys the funds would still be secure.

If you’re going to use mobile, use a multisig setup such as Bitkey.

I need help with multisig setup. What’s the best video?

I'd look into Bitkey. It's multi-sig by default. Your phone, the bitkey device and block server acts each as a key. You need 2 of 3 sign and you have access to a mobile app to check on your stack. In that case you just follow their setup, its multi-sig by default.

Bitkey

Bitcoin Self-Custody Wallet, App & Hardware

Bitkey is a bitcoin self-custody wallet with an app, hardware device, and built-in recovery, so you keep your private keys without losing access.

There have been similar attacks on mobile wallets.

I don’t understand the process of coin flips. I didn’t realize I can generate my own seed words