SSH keys are pretty important in modern software development as they allow services to authenticate their users with a secure key. In most cases this means you can avoid entering passwords you try to connect to a service as it will attempt to connect via your SSH key instead. To create a new SSH key for your machine, open up a terminal and input the following command:
...and that's it! The prompt will show you the directory where your key was stored so you can find it.
On Windows, this is usually:
As this is a hidden file by default, you may need to allow File Explorer to show Hidden Files. Within this folder you can use the id_rsa.pub file to authenticate your machine.
On Mac and Linux, by default your ssh key will be stored at:
Typically services will only ask for your public SSH key. The public key file is denoted by file type, for example: id_rsa.pub. Your private key is then used to authenticate against the public key.