Clean Code: A Handbook of Agile Software Craftsmanship
Robert C. Martin
The Linux DevOps Handbook: Customize and Scale your Linux Distributions ...
Damian Wojsław & Grzegorz Adamowicz
PHP Crash Course - The Complete, Modern, Hands-On Guide
Matt Smith
PostgreSQL Notes for Professionals
GoalKicker.com
Kubernetes in Action: Second Edition
Marko Lukša