GNOME specific terminal commands

Recent changover from windows to Fedora. I am really liking it so far, and I am interested it using the command line more. Does anyone know a good place to learn about the command line generally? But the main question as I am beginning to understand the command line is these gnome specific commands for fedora such as 'gnome-terminal' and 'gnome-control-center' is there a place I can learn about these as I cant find anything on google and it seems quite powerful. Many thanks.