This is the tools page, a list of software/tech tool links to articles and documentation.
Twig, Synfony and Drupal 8 ...
Read the online documentation to learn more about Twig.
sf Synfony documentation
Read the online books to learn more about Synfony.
Theming Drupal 8
This guide is about creating themes for Drupal 8 (drupal.org).
OS X ...
Get Apache, MySQL, PHP and phpMyAdmin working on OSX 10.11 El Capitan
Get your Local Web Development Environment Up & Running on OSX 10.11 El Capitan
Don’t Overthink It Grids
CSS - Tricks, don't overthink it grid.
Scalable and Modular Architecture for CSS.
CSS -Tricks, use srcset.
Complete Guide to Flexbox
CSS -Tricks, guide to Flexbox.