create ssh key mac github

$ ssh-keygen -t rsa -b 4096 -C "[email protected]"

### ADD SSH key to Github  ###

# Check if you have a key?
ssh-add -l

# If not? then follow steps to generate key
ssh-keygen -t rsa -b 4096 -C your__gmail

# Now for copy the key use xclip tool or just goto file and copy
sudo apt install xclip
xclip -sel clip < ~/.ssh/id_rsa.pub

# Now goto github.com and goto settings 
# select  SSH and GPG keys
# New SSH key
# Enter "your__choice__name" in title field...
# Paste your public key into the Key field
# Click Add SSH key

DONE!!! 

$ ssh-add -K ~/.ssh/id_rsa

$ ssh-keygen -t ed25519 -C "[email protected]"