differences?

I wanted to know what is the difference between some of these things.  Like what is the difference between cost per action and cost per click and stuff like that.  I hear so much stuff about it and I think some of this stuff is expensive in its on own right, however i mostly intereseted in Cost per Click.  Is that like google ads or something or can I do it on any site? what about how to get started with doing that and what do I need to do to get started with getting my links sponsored by google?

 

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