Dense, no-nonsense reference cards for the commands, patterns, and codes you already understand but never remember the exact syntax for.
Branching, rebasing, undoing mistakes, and the commands you Google every time.
Common patterns for emails, dates, whitespace, and lookaheads that actually work.
What every 2xx, 3xx, 4xx, and 5xx code actually means, with real causes.
File permissions, process management, networking, and disk usage commands.
Containers, images, volumes, networks, and Docker Compose in one place.
Queries, joins, indexes, and the syntax you forget between projects.
Headers, tables, code blocks, and the syntax GitHub actually renders.
Multi-cursor editing, navigation, and the shortcuts that actually save time.
Most cheat sheets online are buried inside 3,000-word articles with an ad between every paragraph. This is the opposite: one page per topic, every entry scannable in a few seconds, nothing to scroll past.
New reference cards get added over time based on what people actually search for.