1) ssh to your droplet

2) connect ssh to github

`ls -la

[before] root root .ssh
Here .ssh is under the root so as the user (let’s say user1) you don’t have Permission

run
sudo chown -R user1:user1 /home/user1

chown is change owner -R is recursive change anything in home user1
change everything in /home/user1 to user1:user1

`ls -la

[after] user1 user1 .ssh

check github of how on create a ssh key

cat .ssh/id_rsa_github.pub

copy and past to github

ssh-add /home/uers1/.ssh/id_rsa_github

If you got Could not open a connection to your authentication agent run

eval `ssh-agent -s` => to activate the ssh agent

If you got @ WARNING: UNPROTECTED PRIVATE KEY FILE! @ run

sudo chmod 400 id_rsa_github

finally

git clone git@github.com:name/xxx-xxx.git