Error
The authenticity of host 'github.com (140.82.113.4)' can't be established.
Fix
ssh-keyscan github.com >> ~/.ssh/known_hosts
Error
The authenticity of host 'github.com (140.82.113.4)' can't be established.
Fix
ssh-keyscan github.com >> ~/.ssh/known_hosts
$ git checkout --orphan NEWBRANCH
$ git rm -rf .
--orphan
creates a new branch, but it starts without any commit. After running the above command you are on a new branch "NEWBRANCH", and the first commit you create from this state will start a new history without any ancestry.
You can then start adding files and commit them and they will live in their own branch. If you take a look at the log, you will see that it is isolated from the original log.