Transferring Entire Site from one Domain to Another

Hello,

I currently have a website which I want to keep, but I want all of it to be transferred to a different domain name (ex. https://www.site1.com –> https://www.site2.com). Both domains were purchased from GoDaddy, and they each have their own Economy Hosting packages which I purchased for them. I want all the content (theme, blogs, videos, photos, files, etc) to be transferred from the old database to the new one. I am honestly not the most highly trained on the technical side of websites, so if someone could provide me with an easy solution I would be so grateful!!!