I learned that there is more than pressing the UP arrow to works with the shell history. There are also handy little shorthands.
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I learned about the crazy concept of completion values in JavaScript.
I learned that caniuse.com can be enriched with your very own Google Analytics data. This can help making the right decisions.
I learned that code that doesn't look valid can be valid... sometimes.
I learned about a trick where double clicking on a MacOS window expands the whole window.