Step 1: Download Putty Client Software from below link as per your system compatibility.
Step 2: Enter IP Address and select connection type ssh with port 22.
Step 3: Enter Username in auto-login section; it will save your time by not entering username each and everything while taking access.
Step 4: Upload your SSH-Key Path in Auth tab
Step 5: Save the Session after configured all things from this are not required to do above Steps 1-4.
Step 6: Double Click the saved session and you are connected to the server.
These are the simple steps to connect Linux Server from windows using Putty.