How did China affect Japan, in any way.

I am working on a project in my school about the similarities between Japan and China, and I couldn't find any direct sources, so i had to manually pull up each bit of information and tie it together to the best of my ability. I have only a small bit of culture down, and most of language, but there are sources that I do not fully place my trust upon, especially if they may give me the wrong information and tumble me down onto an F. I'd appreciate it if any common knowledge or information possible could be written down.

Thank you~