* Algorithms Video Lectures; Robert Sedgewick; O'Reilly Online
* Apache Tomcat Best Practises; 3-day on-site training
* AWS Immersion Day; Amazon; 1-day interactive online training 
* Cloud Operations on AWS - Learn how to configure, deploy, maintain, and troubleshoot your AWS environments; 3-day online live training with labs; Amazon
* Developing IaC with Terraform (with Live Lessons); O'Reilly Online
* F5 Loadbalancers Training; 2-day on-site training; F5, Inc. 
* Functional programming lecture; Remote University of Hagen
* Linux Security and Isolation APIs Training; Michael Kerrisk; 3-day on-site training
* MySQL Deep Dive Workshop; 2-day on-site training
* Protocol buffers; O'Reilly Online
* Red Hat Certified System Administrator; Course + certification (Although I had the option, I decided not to take the next course as it is more effective to self learn what I need)
* Scripting Vim; Damian Conway; O'Reilly Online
* Structure and Interpretation of Computer Programs; Harold Abelson and more...; 
* The Ultimate Kubernetes Bootcamp; School of Devops; O'Reilly Online
* The Well-Grounded Rubyist Video Edition; David. A. Black; O'Reilly Online
* Ultimate Go Programming; Bill Kennedy; O'Reilly Online