Tutorials, challenges, courses, skill paths, playgrounds, and more — search the whole library in one place.
Learn how servers actually work by building a tiny TCP server and client from scratch. A hands-on introduction to sockets, TCP, and the network programming model every backend, DevOps, and platform engineer should go through at least once.
Build a Kubernetes operator for a small Pet API, first as a 15-line bash loop and then as a Go controller with controller-runtime. Every Pet gets a Pod to live in, gets hungry as time passes, and runs away if nobody feeds it. Along the way, you'll see how the reconcile loop works.
Follow along with Liz Rice's classic GOTO 2018 presentation and build your own container runtime in under 100 lines of Go using Linux namespaces, chroot, and cgroups.
Discover how Go functions under the hood as a modern systems programming language. Learn how Go makes system calls directly, resulting in self-contained binaries that have no libc dependencies.
A Go service that has always been shipped as a static binary in a scratch-y image suddenly fails to start in a container, while the local build works as before. Find what recent changes caused it and fix the image without reverting them.
A stubborn process is running on the system, kill it :)
Refactor a slow, single-threaded C file downloader that fetches files sequentially into a multi-threaded program using POSIX Threads (pthreads) to achieve concurrent downloads.
Write a C program that calls fork() to clone a process and execve() to execute a command, then print and retrieve the child process PID.
Learn how to install Dagger and write the first modules to build, test, and deploy your application.
A hands-on learning path that teaches how to use eBPF and XDP for high-performance, in-kernel packet processing, from protocol parsing to advanced use cases like firewalling, rate limiting, and load balancing.
In this learning path, you’ll go from comparing different tracing program types — tracepoints, raw tracepoints, kprobes, and fprobes — to writing portable eBPF programs that work reliably across environments. You’ll also understand the role of BTF and learn how to make your eBPF code portable even when BTF isn’t available on the target system.
Learn eBPF from the ground up — from writing and running your first program, to storing data in eBPF maps, inspecting and monitoring kernel activity using bpftool and bpftop, and understanding how the verifier ensures safe eBPF execution. Finish with a hands-on challenge to put your new skills to the test.
Get a disposable agentic coding environment in seconds. Claude Code, Codex, Gemini CLI, and Opencode pre-installed and ready to use.
Try ShellGym - an interactive Linux command-line trainer - in a ready-made Ubuntu VM: daemon running, web UI open, sample learning path loaded.
A collection of mini-programs demonstrating Kubernetes client-go usage and a loaded IDE. Handy if you need to write a controller or two.
