with just goal to better understand where tor interferes and where it hides my browsing from ISP, please look at this picture which just explains how to computers communicate.
You can check on step 6 they mention ISP knows which computer I want to talk to.
Say I want to talk to site www.hello.com using Tor. Now how would this flow go, would in step 6 ISP not see, www.hello.com anymore? what would it see then?