Step 1 - Generate SSH key first

ssh-keygen -t ed25519 -C "your-github-email@email.com"





Just press enter 




again press enter , now your key will generate 
















Step 2 - Copy the new SSH key 

 cat /home/kahnucharanswain/.ssh/id_ed25519.pub


please use your path eg. 
Step 3 - Copy the whole key 



Step -4 Open github account -> settings ->SSH and GPG keys










step 5 - click on new ssh key now add the copied ssh key 











Now click Add SSH key to add the ssh 

Done!!!