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Links I keep reopening: small tools that save an afternoon, references I trust, and a couple of rabbit holes worth falling into twice.
roadmap.shCommunity-built learning paths for nearly every engineering role.regex101Build, test and explain regular expressions without the guesswork.ExcalidrawHand-drawn whiteboard for quick architecture sketches.explainshellPaste a shell command and see what every flag does.Refactoring.GuruDesign patterns and refactorings, explained with diagrams.crontab.guruThe fastest way to sanity-check a cron expression.