Bookshelf
The things I have published in book form, together with writing substantial enough to read like a small free book.
Published book · 2026
A Screen-Free STEM Coloring & Activity Book for Kids Ages 4–8
A playful introduction to coding, robots, algorithms, loops, binary, pixels, networks and password safety. Available in English, Portuguese, Spanish and French.
Book details and editionsLong-form notes · Free to read
An overview of modern Unix-like systems and practical administration.
Study notes that grew into a detailed guide covering the shell, permissions, processes, filesystems, networking, services and everyday administration.
Read the full notes