Lightning Network is a hot trend and its growth from 2020 to 2021 is amazing.
A book about it, from Andreas,
Mastering the Lightning network. It is almost done and is planned to publish in Q4 this year.
Mastering the Lightning Network is an O'Reilly Media book, due for publication in Q4'2021, and announced in August 2019 by authors Andreas M. Antonopoulos (@aantonop), Olaoluwa Osuntokun (@roasbeef), Rene Pickhardt (@renepickhardt).
The book describes the Lightning Network (LN), a Peer-to-Peer protocol running on top of Bitcoin and other blockchains, which provides near-instant, secure, micro-payments.
The book is suitable for technical readers with an understanding of the fundamentals of Bitcoin and other open blockchains.