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Skills are the most underused feature in Claude Code. This guide covers everything: where skill files live, the full frontmatter spec, how invocation works, writing good descriptions, passing arguments, and real examples you can copy today.

The sliding window pattern shows up in rate limiters, monitoring dashboards, and analytics pipelines. This guide explains the concept from first principles, then builds a real-time stock price monitor in Go step by step — explaining each piece before writing a line of code.

Most WebSocket tutorials start at the API. This one starts at the wire — electrons, NIC interrupts, kernel socket buffers, the TCP state machine, the HTTP upgrade handshake, the binary frame format — and works up to what ws.send() actually does.

Two identifiers, two different jobs. DefId names a definition across the whole compiler pipeline and across crates. HirId points to a node in the syntax tree of the current crate. Mixing them up is the first stumbling block when reading rustc source code.

Most comparisons of gRPC streaming vs unary stop at the API surface. This one goes to the wire — HTTP/2 frames, protobuf framing, peak memory, and latency to first byte.