Stuff on the Dock that I don't want can be removed. And I added a Terminal there to get the command line.
Hostname -- Settings, general, sharing, edit local hostname at bottomWhat are Numbers, Pages, not to mention FaceTime?
Numbers is a spreadsheet and Pages is a word processor. These are similar to Microsoft Excel and Word. FaceTime is an apple only video and/or audio call app.
Log out using the apple menu (top left).