I'd recommend to read the online version for free, or listen to the audiobook (for free too). https://21lessons.com/audio
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
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