Cache Policy in Cloudfront

Hello All, I am trying to use cloudfront for my website. Whenever I use cache policy, I am not sure which headers to use ex. Accept, Host, Origin etc. I was trying hit and trial, sometime it works properly (hit from cloudfront) but sometimes whether it gives error or it works with miss from cloudfront. Please help me out how to use cache policy( headers, cookies, query strings).

Thank you for your support