Welcome to the ssh keys guide
Create the ssh key like so:
ssh-keygen -t ed25519 -C "your_email@example.com"
You can find out other keys you can use by either googling or using man ssh
Find out where the *.pub file is located at and run this command:
cat *.pub
copy the output and paste the output into the ssh section of your github account
Sync your agent with the key:
eval "$(ssh-agent -s)"