Everything about computer keyboards — history (typewriters → IBM Model F/M → Apple Extended → modern customs), layouts (QWERTY, Dvorak, Colemak, Workman), mechanical switches, switch manufacturers (Cherry, Gateron, Kailh, JWK, ZealPC, Holy Pandas), frankenswitches, spring swaps, stem materials, plate & case materials, 3D-printed & hand-wired boards, QMK/VIA/ZMK/KMK firmware, custom cables, maintenance & repair, vintage restoration, famous custom boards (Norbauer, Keycult, Hibi), Keychron, Wooting Hall-Effect, NuPhy & low-profile, group buys, artisan keycaps, photography & sound tests, streaming/content creation, ergonomics, touch-typing, WPM training, accessibility, and a complete endgame-build walkthrough. 46 units, 697 lessons.