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If I am hired to provide a service *via* another company as a vendor (typically 1099 employee which is how i've been earning recently), would I have to enter income earned a different way vs. a client hiring me directly as a contractor?

What would I need to provide the client, and/or what would they need to provide me at the end of the year as an independent contractor. Would I fill out a W-9 every time I work with a new client?

 

I apologize, some of the clarification links provided to some of my questions are wildly confusing to a non-expert. I'm hoping for more simplified answers. I've looked at many of these resources before and not fully understood the process(es).