Why do we use external stylesheets instead of inline or embedded styles?
External stylesheets are helpful if multiple pages make use of the same style and format. With an external stylesheet it is like you are making a template for the website.
What is the difference between SSH and FTP and why do we use each?
SSH allows for remote control of a computer so that you can use it as if you were physically there. SSH clients are needed to connect to a server and come in different varieties. Meanwhile FTP stands for file transfer protocol is used to transfer files only to and from a server without needing to physically access the server.