[General] Bitcoin Wallets - Which, what, why?: https://bitcointalk.org/index.php?topic=1631151.0
A Beginner's Guide to Blockchain Technology: https://www.coindesk.com/information/
Bitcoin: A Peer-to-Peer Electronic Cash System: https://bitcoin.org/bitcoin.pdf
Explain Bitcoin Like I’m Five: https://medium.freecodecamp.org/explain-bitcoin-like-im-five-73b4257ac833

Bitcoin for Beginners (Andreas Antonopoulos video series): https://www.youtube.com/playlist?list=PLPQwGV1aLnTuN6kdNWlElfr2tzigB9Nnj