When I created the SSH key for the git then I face the error
when i running the command

ssh-add ~/.ssh/id_ed25519

of id_ed25519 no such file found.

Solution

1.

change the file name id_rsa.
ssh-add ~/.ssh/id_rsa

2.

For copy the key we follow the given command
clip < ~/.ssh/id_rsa.pub

3.

At last one more command.
Just add Github fingerprint to known hosts this way:

ssh-keyscan -t rsa github.com >> ~/.ssh/known_hosts 

then push the project
HAPPY CODING☺☺☺