Authenticate GitHub Using SSH - Step By Step

There are multiple algorithms available to generate the SSH("Secure Shell") keys

1. ssh-keygen -t rsa -b 4096
1. Old algorithm not recommended to use.
2. ssh-keygen -t dsa
1. Old US government Digital Signature Algorithm.
3. ssh-keygen -t ecdsa -b 521
1. New Digital Signature Algorithm standardized by the US government
4. ssh-keygen -t ed25519
1. New algorithm added in OpenSSH.
2. Recommended by github.com

in the above commands 

    -t means type

    -b means no of bits

    -rsa, dsa, ecdsa, ed25519 are algorithms

Step 1:

cd ~/.ssh

Step 2:

ssh-keygen -t ed25519 -C "youremail@domain.com"

Step 3:

eval "$(ssh-agent -s)"  or eval `ssh-agent`

Step 4:

ssh-add dshyam2109  (<- your key name)

Step 5

cat dshyam2109.pub

Step 6:

Copy your public key from above step and paste it in the GitHub -> Settings as shown in below screenshot.

Now you can successfully access your repositories using SSH key.

You can find more information here 

1. SSH
2. GitHub

Alternate ways:

1. Windows credential manager to store GitHub username & password.
2. Install GitHub desktop (Recommended easy to use for beginners)