create ssh key with custom location and name

create_ssh_key_guide.txt

#create ssh key with specified location and name
ssh-keygen -t ed25519 -f ~/.ssh/key_name -C "[email protected]"

eval "$(ssh-agent -s)"

open ~/.ssh/config

#in case config file does not exist
touch ~/.ssh/config

# >>> content for config file: <<<
Host github.com
  AddKeysToAgent yes
  UseKeychain yes                 //remove if you do not pass the passphase for the key
  IdentityFile ~/.ssh/id_ed25519
  
# >>> save the config file and back to the terminal window <<<

#add your SSH private key to the ssh-agent and store your passphrase in the keychain
#if you do not pass the passphase for the key, remove --apple-use-keychain option
ssh-add --apple-use-keychain ~/.ssh/id_ed25519