How to reveal hidden files in macOS (and hide visible ones)

A few techniques let you see files marked as hidden, whether intentionally or otherwise, and reverse their status.
MacBook user
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Glenn Fleishman’s most recent books include Take Control of Zoom, Second Edition, Take Control of Your M-Series Mac, and Take Control of Securing Your Mac. In his spare time, he makes Tiny Type Museums. He’s a senior contributor to Macworld, where he writes Mac 911.