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Most shell scripts work fine until a file name has a space in it or a command fails halfway through. Learn strict mode, quoting, safe temporary files and cleanup traps, then put it all together in a real backup script.
Why does a resolved promise always beat setTimeout(fn, 0)? Learn exactly how the event loop schedules tasks, microtasks and repaints, and how to keep long work from freezing the page.
When two CSS rules disagree, the browser follows a strict set of rules to pick a winner. Learn how the cascade decides, calculate specificity by hand, and stop reaching for !important.
GROUP BY squashes rows together; window functions calculate across rows and keep every one of them. Learn OVER, PARTITION BY, ROW_NUMBER, RANK, LAG and window frames with small, runnable examples.
Learn how B-tree indexes really work, read query plans with EXPLAIN, choose the right column order for composite indexes, and spot the mistakes that silently disable an index.
