Is there any way to create a text file without using the terminal at all?
Ubuntu 16.04 and earlier:
Ubuntu 16.10 and Later:
Later versions of Nautilus ("Files") removed this feature so you cannot create a blank text-file by just clicking anywhere. You need to use the "Templates" folder for this purpose.
Then open a Terminal in that folder (by right clicking > "Open in Terminal") and then type the following command in the terminal.
touch "Blank Document"
You can name this file anything you want. I personally prefer "Blank Document" because what it creates is essentially a blank document.
Note: You can use the Templates folder to do many other things like creating a particular image, etc. Anything you put there will appear in the "New Document" menu.
"Without opening the terminal" - if you press Alt+F2, you get a mini-command line, which will close as soon as you press return and it executes your command - is that allowed?
If so, Alt+F2, then
This has the advantage of not having to take your hand from the keyboard to use the mouse.