Cheatsheets
Tables, not prose. Each page here is a quick-reference card for a topic developers and agents look up repeatedly: git incantations, bash one-liners, CSS selectors, HTTP status codes, regex patterns, Markdown variants, EXPLAIN node types, and schema.org types. Use these when you want the answer in one screen.
Pages
- Git commands: inspect, undo, branch, sync, rebase, stash, recover. The commands worth memorizing and the flags that matter.
- Bash one-liners: find and replace, file discovery, jobs and traps, parameter expansion, arithmetic. With the why next to the what.
- Postgres EXPLAIN: node types, cost components, scan strategies, buffer reading, and the thresholds that warrant action.
- CSS selectors: every selector type with example, specificity score, and use case, including
:has,:is,:where,:not, and:nth-child. - HTTP status codes: the full table with meanings and the “what to use when” guide for API design.
- Regex patterns: canonical patterns for email, URL, dates, IPs, and ports, plus a character-class reference.
- Markdown syntax: CommonMark, GFM, Obsidian, and MDX compared. Which syntax works where for tables, footnotes, math, callouts, and wikilinks.
- schema.org types: the types worth shipping, the required fields, and the rich results each one unlocks.