These are nice tips! To add to a few more:
$0 is the currently selected element in the elements viewer tab
$$() is shorthand for document.querySelectorAll()
You can use the color picker to get a color on any page by clicking on a color box in the css. You can change the color format with the arrows to the right.
To add to this: $1 is the previously selected element, $2 the one before that, etc, etc.
Wow, it seems so obvious, but I never even knew that.
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