Creating your own actions in PhotoShop is a time-saving way of applying the same effects to multiple layers/images, and there are many tutorials around the Internet to teach you how to do that.
This is a list of actions that have been created for you. It is not so much time-saving to use someone else’s action, it is a way to achieve an effect that you may not be able to create for yourself (and how frustrating can that be!). You can also learn a lot from these actions – just open the file in the Actions dock in PhotoShop and you can see how the end result is achieved.
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