How do I restart unity with everything gone

Hello all

I have done some things to the scripts on several of the Assets, so now they don’t work and since I am just learning how to script it has gotten a little out of hand for me. so I am wondering is there a way to re-install Unity with all assets and saved things gone (so it is just like you just downloaded it) I tried uninstalling and then re-installing it but all the messed up assets were still there.
I using the free version of unity.


Make a new project.