Emacs Lisp Elements(protesilaos.com)
326 points by robenkleene | 50 comments
Online book by Protesilaos Stavrou giving a big-picture overview of the Emacs Lisp programming language, stable version 1.0.0 released 2025-04-12.
#free-book on Hacker News
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Beej's Guide to Git(beej.us)
894 points by mixto | 280 comments
Landing page for Beej's Guide to Git, a free online guide to the Git version control system offered in HTML and other downloadable formats.
Understanding Deep Learning(udlbook.github.io)
347 points by georgehill | 79 comments
Homepage for Simon J.D. Prince's book Understanding Deep Learning (MIT Press, 2023), offering a free draft PDF of chapters 1-21 under a CC license.