This one?
Discussion
I started with that one, later dived into this doc below.
https://thebitcoinmanual.com/articles/delegated-event-signings-nostr/

I liked idea of keeping the seed/main keys offline. Only using delegated keys on apps.
Offline will act as a password reset by revoking old delegate and delegating new one.
Also handy for scheduled publishing tools.
Hadn't seen that one, thanks. Insane the amount of innovation going on
I just can't keep up and I was behind to start with. I think I need to enroll on a course in cryptography, cybersecurity and programming. Any suggestions?
This book must be good with hands on coding exercises. I have been listening to the author for a while. He is also Bitcoin developer.

Looks neat!!!
But for Bitcoin? I use this. Based on a Raspberry Pi, a whole lot cheaper and better than a Ledger.
Full tutorial here:
This guy sells a self-assembly kit ready in 5 mins, with WiFi physically disabled. Just bring your own power supply and SD card.
It can't get any easier if BTC sessions covered this on his channel. Thank you for sharing 🤙