unable install

[Ygarr]

 git clone git@github.com:xero/dotfiles.git
Cloning into 'dotfiles'...
The authenticity of host 'github.com (140.82.121.4)' can't be established.
ED25519 key fingerprint is SHA256:+DiY3wvvV6TuJJhbpZisF/zLDA0zPMSvHdkr4UvCOqU.
This key is not known by any other names.
Are you sure you want to continue connecting (yes/no/[fingerprint])? yes
Warning: Permanently added 'github.com' (ED25519) to the list of known hosts.
git@github.com: Permission denied (publickey).
fatal: Could not read from remote repository.

Please make sure you have the correct access rights
and the repository exists.

then

git clone --filter=blob:none --single-branch https://github.com/folke/lazy.nvim.git ~/.local/share/nvim/lazy 
fatal: destination path '/home/u/.local/share/nvim/lazy' already exists and is not an empty directory.