https://21lessons.com/ by nostr:npub1dergggklka99wwrs92yz8wdjs952h2ux2ha2ed598ngwu9w7a6fsh9xzpc / I recommend buying the print edition on Amazon to support our fellow #nostrich
https://learnmeabitcoin.com/ / someone just posted this as a good resource, looks to be comprehensive as well
