My Gemini capsule
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This site contains a list of resources I found helpful. I am not an expert in all of these topics, but all the resources listed here impacted me. I read some of the books quite a long time ago, so there might be newer editions out there already, and I might need to refresh some of the knowledge.

The list may not be exhaustive, but I will be adding more in the future. I firmly believe that educating yourself further is one of the most important things to advance. The lists are in random order and reshuffled every time (via sort -R) when updates are made.

You won't find any links on this site because, over time, the links will break. Please use your favourite search engine when you are interested in one of the resources...

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Technical books

  • Programming Perl aka "The Camel Book"; Tom Christiansen, brian d foy, Larry Wall & Jon Orwant; O'Reilly
  • Distributed Systems: Principles and Paradigms; Andrew S. Tanenbaum; Pearson
  • Java ist auch eine Insel; Christian Ullenboom;
  • Funktionale Programmierung; Peter Pepper; Springer
  • Pro Git; Scott Chacon, Ben Straub; Apress
  • 21st Century C: C Tips from the New School; Ben Klemens; O'Reilly
  • Learn You a Haskell for Great Good!; Miran Lipovaca; No Starch Press
  • The Go Programming Language; Alan A. A. Donovan; Addison-Wesley Professional
  • Effective Java; Joshua Bloch; Addison-Wesley Professional
  • The Practise of System and Network Administration; Thomas A. Limoncelli, Christina J. Hogan, Strata R. Chalup; Addison-Wesley Professional
  • Object-Oriented Programming with ANSI-C; Axel-Tobias Schreiner
  • Raku Recipes; J.J. Merelo; Apress
  • Effective awk programming; Arnold Robbins; O'Reilly
  • The Pragmatic Programmer; David Thomas; Addison-Wesley
  • Concurrency in Go; Katherine Cox-Buday; O'Reilly
  • Learn You Some Erlang for Great Good; Fred Herbert; No Starch Press
  • The Docker Book; James Turnbull; Kindle
  • DNS and BIND; Cricket Liu; O'Reilly
  • Think Raku (aka Think Perl 6); Laurent Rosenfeld, Allen B. Downey; O'Reilly
  • Modern Perl; Chromatic ; Onyx Neon Press
  • Clusterbau mit Linux-HA; Michael Schwartzkopff; O'Reilly
  • C++ Programming Language; Bjarne Stroustrup;
  • Data Science at the Command Line; Jeroen Janssens; O'Reilly
  • Developing Games in Java; David Brackeen and others...; New Riders
  • Systemprogrammierung in Go; Frank Müller; dpunkt
  • Higher Order Perl; Mark Dominus; Morgan Kaufmann
  • Systems Performance Tuning; Gian-Paolo D. Musumeci and others...; O'Reilly
  • Pro Puppet; James Turnbull, Jeffrey McCune; Apress
  • Site Reliability Engineering; How Google runs production systems; O'Reilly

Technical references

I didn't read them from the beginning to the end, but I am using them to look up things.

  • The Linux Programming Interface; Michael Kerrisk; No Starch Press
  • Relayd and Httpd Mastery; Michael W Lucas
  • Algorithms; Robert Sedgewick, Kevin Wayne; Addison Wesley
  • Understanding the Linux Kernel; Daniel P. Bovet, Marco Cesati; O'Reilly

Self-development and soft-skills books

  • The Daily Stoic; Ryan Holiday, Stephen Hanselman; Profile Books
  • Psycho-Cybernetics; Maxwell Maltz; Perigee Books
  • The Phoenix Project - A Novel About IT, DevOps, and Helping your Business Win; Gene Kim and Kevin Behr; Trade Select
  • The Joy of Missing Out; Christina Crook; New Society Publishers
  • The Bullet Journal Method; Ryder Carroll; Fourth Estate
  • Ultralearning; Anna Laurent; Self-published via Amazon
  • Stop starting, start finishing; Arne Roock; Lean-Kanban University
  • So Good They Can't Ignore You; Cal Newport; Business Plus
  • Digital Minimalism; Cal Newport; Portofolio Penguin
  • The Obstacle Is The Way; Ryan Holiday; Profile Books Ltd
  • Never Split the Difference; Chris Voss, Tahl Raz; Random House Business
  • The 7 Habits Of Highly Effective People; Stephen R. Covey; Simon & Schuster UK
  • Soft Skills; John Sommez; Manning Publications
  • Deep Work; Cal Newport; Piatkus
  • Who Moved My Cheese?; Dr. Spencer Johnson; Vermilion
  • The Off Switch; Mark Cropley; Virgin Books
  • Time Management for System Administrators; Thomas A. Limoncelli; O'Reilly
  • Eat That Frog!; Brian Tracy; Hodder Paperbacks
  • Consciousness: A Very Short Introduction; Susan Blackmore; Oxford Uiversity Press
  • Atomic Habits; James Clear; Random House Business
  • Ultralearning; Scott Young; Thorsons
  • The Power of Now; Eckhard Tolle; Yellow Kite
  • The Complete Software Developer's Career Guide; John Sonmez; Unabridged Audiobook

Here are notes of mine for some of the books

Technical video lectures and courses

Some of these were in-person with exams; others were online learning lectures only.

  • Linux Security and Isolation APIs Training; Michael Kerrisk; 3-day on-site training
  • F5 Loadbalancers Training; 2-day on-site training; F5, Inc.
  • Algorithms Video Lectures; Robert Sedgewick; O'Reilly Online
  • Ultimate Go Programming; Bill Kennedy; 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)
  • Apache Tomcat Best Practises; 3-day on-site training
  • The Well-Grounded Rubyist Video Edition; David. A. Black; O'Reilly Online
  • Protocol buffers; O'Reilly Online
  • MySQL Deep Dive Workshop; 2-day on-site training
  • 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
  • Functional programming lecture; Remote University of Hagen

Read here about my thoughts on "The Well-Grounded Rubyist"


These are not whole books, but guides (smaller or larger) which I found very useful.

Podcasts I like

  • BSD Now
  • CRE: Technik, Kultur, Gesellschaft (de)
  • Deep Questions with Cal Newport
  • FLOSS Weekly
  • Go Time (Changelog)
  • Java Pub House
  • Ship it (Changelog)
  • The Minimalists

Fiction and more books

Many fiction and non-fiction books I read are not listed here. But my favourites are listed on a separate page here:

Other resources (including novels) I've read.

Formal education

I have met many self-taught IT professionals I highly respect. In my own opinion, a formal degree does not automatically qualify a person for a particular job. It is more about how you educate yourself further after formal education. The pragmatic way of thinking and getting things done do not require a college or university degree.

However, I still believe a degree in Computer Science helps to understand all the theories involved that you would have never learned otherwise. Isn't it cool to understand how compilers work under the hood (automata theory) even if you are not required to hack the compiler in your current position? You could apply the same theory for other things too. This was just one example.

  • One year Student exchange program in OH, USA
  • German School Majors (Abitur), focus areas: German and Mathematics
  • Half-year internship as a C/C++ programmer in Sofia, Bulgaria
  • Graduated from University as Diplom-Inform. (FH) at the Aachen University of Applied Sciences, Germany

My diploma thesis, "Object-oriented development of a GUI based tool for event-based simulation of distributed systems," can be found at:

I was one of the last students handed out an "old fashioned" German Diploma degree before the University switched to the international Bachelor and Master versions. To give you an idea: The "Diplom-Inform. (FH)" means translated "Diploma in Informatics from a University of Applied Sciences (FH: Fachhochschule)". Going after the international student credit score, it can be seen as an equivalent to a "Master in Computer Science" degree.

Colleges and Universities are costly in many countries. Come to Germany, the first college degree is for free (if you finish within a certain deadline!)

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