Node.js Web Development: Server-side web development made easy ...
David Herron
PHP 8 Programming Tips, Tricks and Best Practices: A Practical ...
Doug Bierer & Cal Evans
Android Programming for Beginners: Build in-depth, full-featured ...
John Horton
Java Performance: In-Depth Advice for Tuning and Programming ...
Scott Oaks
Linux Notes for Professionals
GoalKicker.com
SQL Notes for Professionals
MySQL Notes for Professionals
PostgreSQL Notes for Professionals
Git Notes for Professionals