I stumbled upon this selector in CSS recently and I did a little reading on it and found its use cases very interesting so I decided to share it.

The :not() CSS selector has a wide range of use cases.

Use Cases

The general idea behind it's use case is to prevent certain items from being selected, hence it is known as the negation pseudo-class.

Using this saves you time and more lines of code, as in this case you would have had to give the remaining p tags a specific class name and apply the style to that class.

Linking :not() with other pseudo selectors

This selector can also be used together with other pseudo-class and pseudo-element selectors. For example, the following will add a box shadow and a background color to all buttons that do not contain the plump class when they are being hovered on.

Using :not() globally

You can also use the tag :not() selector globally in the sense that you are not applying it to an element so it selects all elements in the document except the ones specified in the brackets

The CSS style above styles the color of every element in the document except the buttons.
Another example of the :not() Selector use case is this:

More Examples

The above example will style all input text fields that are not disabled.
I hope you understand the basics and the general idea behind this awesome CSS Selector.

Resources for more insights

For further insights on the :not() Selector, I would recommend you check:
https://developer.mozilla.org/en-US/docs/Web/CSS/:not
https://tympanus.net/codrops/css_reference/not/