Step-by-step, task-oriented guides — do this, in this order, to get this result.
A complete walkthrough from a fresh RetroArch install to a properly configured, playable core — including the two steps most first-time setups skip.
A complete walkthrough installing nginx, enabling it as a proper rc.conf-managed service, and serving a first site — the FreeBSD-idiomatic way, not a generic Linux tutorial adapted.
A complete walkthrough getting the native toolchain installed, writing a minimal Kit-based application, and building Haiku itself from source.
A practical guide to viewing and setting file attributes, building a saved query, and turning that query into a self-updating virtual folder in Tracker.
A complete walkthrough of both the graphical and command-line paths to installing, updating, and removing software on Haiku.
A complete walkthrough from downloading the image to a working desktop, including why starting in a VM is worth doing even if your real goal is bare-metal installation.
A complete walkthrough Haiku's Deskbar (its taskbar/menu equivalent) and its multiple-workspace system — features inherited directly from BeOS, still central to how Haiku is meant to be used day to day.
A complete walkthrough backing up a Haiku installation using BFS attributes and standard file-copying tools, plus what to know about restoring packagefs-managed system data specifically.
A complete walkthrough creating additional user accounts on Haiku, understanding its current multi-user maturity, and what to expect versus a fully mature multi-user Unix system.
A complete walkthrough Haiku's Terminal application and its bash-based shell — familiar to anyone with Unix experience, with a few Haiku-specific tools worth knowing about.