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What's inside

Three places to start. Go deep.

Pick where you are: the foundations, the language underneath everything, or hands-on guides from real work.

CS Fundamentals

How a computer actually runs a program: memory, algorithms and data structures, through CS50 and beyond.

Explore the foundations

C

Pointers, memory you manage yourself, and notes from K&R: where you stop guessing what the machine does.

Dive into C

Lab

Hands-on guides and cheatsheets from real work: the commands, workflows and fixes that actually came up. Git today, Docker and CI/CD next.

Open the Lab

Learning in the open

No polish. Just the real notes.

“Note-taking is thinking made visible.”

Every entry is written mid-struggle, not after: K&R exercises that owned a whole weekend, CS50 problems that clicked only on the third try. No cleaned-up recaps. The path is open if you want to walk it.

Read the notes

Latest notes

Fresh from the notebook. Read along.

Lab · May 9, 2026 Git A practical reference built from real experience: commands, workflows and solutions that actually came up. Read Java · May 7, 2025 Generic Types in Java How Java generics work across interfaces, classes and multi-type scenarios, with real examples. Read Blog · May 9, 2026 Why My Article Showed 11 Months Ago as Creation Date A full debugging story, and everything I tried before finding the real fix. Read

Al-Fahami Toihir in front of a waterfall

Behind the notes

Hi, I'm Al-Fahami. I write these notes.

Software engineer at DXC Technology, building microservices with Java and Spring Boot. When I'm not learning computer science, you'll find me at the gym, in the forest, swimming, or anywhere out in nature.

More about me

Your turn

Start where you are. Go as deep as you want.

Start with the fundamentals