Written by Wojciech Ogrodowczyk who takes photos, climbs mountains, and runs Brains & Beards to help companies deliver better mobile applications faster.

The Science of Self-Learning

"How to Teach Yourself Anything, Learn More in Less Time, and Direct Your Own Education". Simple introduction to basics and tactics of learning things on your own.

Never Split the Difference

A book on negotiation tactics that doesn't try to make the other side say "yes", but rather get them to commit.

The Life-Changing Magic of Tidying Up: The Japanese Art of Decluttering and Organizing

It's a world-famous book on how to keep your house / office / garage (/ life?) tidy. Instead of focusing on organising techniques it focuses on letting go of stuff that we own, but do not need (in other words: clutter).

Essentialism: The Disciplined Pursuit of Less

Essentialism is a how-to book for deciding what's important and what's not. It tells us how to focus on the former and get it done. As a person who likes to improve my personal (and work) processes, I obviously enjoyed it, but I also think it helped me level-up my personal productivity.