Confusion about git; how to undo?
- by dan
I wanted to install some source code that was on git.  Don't really know what that means, I've never used git before, but I figured it was time to learn so,
I first installed git.  
Next I tried to clone the git directory of the software I want to install.
I got a message saying "the authenticity of  can't be established".  I went ahead and ended up with another message saying warning such and such will be added to known hosts.  I went ahead and it said something about hanging up on the connection.
After searching the internet for a while I realized I didn't need git to install the software but now I have it installed and have added some host to some file or another.  I'm concerned I've created some security issues I need to fix.
Can anyone help me undo what I've done, or better understand what I've done.  Did adding a git project open up my system?  Beyond that can anyone tell me how git works.  Everything I've found assumes I know stuff that I don't yet.
Thanks